The pH after 15.0 mL of 0.210 KOH is added in the titration of 55.0 mL of 0.210 M HClO is 4.56.
To solve this problem, we need to use the balanced chemical equation for the reaction between KOH and HClO:
HClO + KOH → KClO + H2O
We can see that for every mole of KOH added, one mole of HClO will react. Therefore, the number of moles of HClO in 55.0 mL of 0.210 M HClO is:
n(HClO) = M(HClO) x V(HClO) = 0.210 mol/L x 0.0550 L = 0.0116 mol
When 15.0 mL of 0.210 M KOH is added, the number of moles of KOH added is:
n(KOH) = M(KOH) x V(KOH) = 0.210 mol/L x 0.0150 L = 0.00315 mol
Since the reaction is a neutralization reaction, the moles of HClO left after the reaction will be:
n(HClO) = n(HClO)initial - n(KOH) = 0.0116 mol - 0.00315 mol = 0.00845 mol
We can now use the equilibrium expression for the ionization of HClO in water to calculate the pH of the solution:
HClO + H2O ⇌ H3O+ + ClO-
Ka = [H3O+][ClO-]/[HClO]
At equilibrium, the concentrations of H3O+ and ClO- can be assumed to be equal to the concentration of HClO that remains unreacted, since HClO is a weak acid and does not dissociate completely in water. Therefore:
[H3O+] = [ClO-] = [HClO] = 0.00845 mol / (0.0550 L + 0.0150 L) = 0.105 M
Substituting these values into the equilibrium expression for Ka:
Ka = [H3O+][ClO-]/[HClO] = (0.105 M)² / 0.00845 M = 1.31 x 10⁻⁶
pKa = -log(Ka) = -log(1.31 x 10⁻⁶) = 5.88
pH = 1/2(pKw - pKa) = 1/2(14.00 - 5.88) = 4.56
Therefore, the pH after 15.0 mL of 0.210 KOH is added in the titration of 55.0 mL of 0.210 M HClO is 4.56.
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For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 atm for all species.
For the reaction
N2(g)+3H2(g)↽−−⇀2NH3(g)
the standard change in Gibbs free energy is Δ°=−32.8 kJ/mol
. What is ΔG for this reaction at 298 K when the partial pressures are N2=0.350 atm
, H2=0.300 atm
, and NH3=0.750 atm
?
The ΔG for the reaction at 298 K and the given partial pressures is -55.53 kJ/mol.
What is ΔG ?
The Gibbs free energy change for a reaction under non-standard conditions can be calculated using the following equation:
ΔG = ΔG° + RTln(Q)
where ΔG is the Gibbs free energy change, ΔG° is the standard Gibbs free energy change, R is the gas constant (8.314 J/(mol·K)), T is the temperature in kelvin, and Q is the reaction quotient.
The reaction quotient, Q, can be calculated using the partial pressures of the gases involved in the reaction:
Q = (P(NH3))² / (P(N2) x P(H2)³)
Plugging in the given values, we get:
Q = (0.75 atm)² / (0.35 atm x 0.30 atm³) = 0.2667
Now we can calculate the ΔG for the reaction:
ΔG = ΔG° + RTln(Q)
ΔG = (-32.8 kJ/mol) + (8.314 J/(mol·K) x 298 K x ln(0.2667))
ΔG = -32.8 kJ/mol + (-22.73 kJ/mol)
ΔG = -55.53 kJ/mol
Therefore, the ΔG for the reaction at 298 K and the given partial pressures is -55.53 kJ/mol.
What is reaction quotient?
Reaction quotient, commonly denoted as Q, is a measure of the relative concentrations of reactants and products in a chemical reaction at a particular moment in time. It is calculated by dividing the concentration of the products raised to their stoichiometric coefficients by the concentration of the reactants raised to their stoichiometric coefficients.
The equation for the reaction quotient Q is similar to the equilibrium constant Kc, but with the concentrations of the reactants and products at any time during the reaction, rather than at equilibrium. When the reaction is at equilibrium, the reaction quotient is equal to the equilibrium constant.
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At what temperature do saturated solutions of potassium nitrate (KNO3) and sodium nitrate (NaNO3) contain the same weight of solute per 100 mL of water?
At 40°C is the temperature at which saturated solutions of potassium nitrate and sodium nitrate contain the same weight of solute per 100 mL of water contain the same weight of solute per 100 mL of water.
Temperature is a unit of warmth or coldness that can be defined in the context of any number of arbitrary scales. It indicates the direction that heat energy will naturally flow, i.e., through a hotter (body) to a colder (body) body.
Temperature is not the same as the energy in a thermodynamic system; for instance, an iceberg has a significantly larger total heat energy than a match, despite the fact that a match is burning at an extremely high temperature. At 40°C is the temperature at which saturated solutions of potassium nitrate and sodium nitrate contain the same weight of solute per 100 mL of water.
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A student mixes 100. mL of 0.25 M HCl(aq) with 200. mL of 0.50 M HClO4(aq) and then dilutes the mixture with distilled water to a total volume of 500. mL. The [H3O+] in the final solution is closest to
(A) 0.0025 M
(B) 0.12 M
(C) 0.25 M
(D) 0.75 M
Answer:
The answer is B: 0.0025 M
According to molar concentration and dilution concept, the [H₃O+] in the final solution is closest to 0.05 M.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.In case of 2 solutions concentrated and diluted it is calculated as, M₁V₁=M₂V₂ substitution gives M₂=0.25×100/500=0.05
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Which statements best describe plasmas? Check all that apply.
• Plasmas have a definite volume.
• Plasmas can change shape.
• Plasmas contain ionized particles
• Plasmas are abundant on Earth.
• Plasmas are good insulators
The statement "Plasmas can change shape" and "Plasmas contain ionized particles" best describe plasmas.
What is plasmas?Plasma is a state of matter that is similar to gas but differs in that it contains ionized particles, which are atoms or molecules that have lost or gained one or more electrons. This results in a mixture of positively charged ions and negatively charged electrons, making plasma electrically conductive.
Plasma can be found in many natural phenomena such as lightning, stars, and the aurora borealis, and it is also used in various technological applications such as plasma TVs, fusion reactors, and fluorescent lights. Because of its unique properties, plasma has many interesting and useful applications in fields such as physics, chemistry, and engineering.
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I need to find the average percent recovery
Consider that after recrystallization, you obtained 7.0 g of dry pure substance from 10.0 g of impure material. Your recovery rate is then 70% (7/10 × 100).
What is the typical recrystallization percentage?Recrystallization recovery percentages are often lower than 100%, though occasionally they might be higher (see the following issue). This is brought on by impurity loss, material that was left in the liquid solution after dissolving, and "mechanical losses."
What drives our % recovery calculations?The amount if pure compound that is present in the finished chemical synthesis product is calculated using the percent recovery. The ratio of actual yield to theoretical yield is used to compute percent yield. The ratio of the pure compound to the starting compound is used to calculate percent recovery.
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What is true of spontaneous reactions?
O They are indicated by a negative change in Gibbs free energy.
O They have a positive value of AS.
O They are instantaneous.
O They always release heat.
Help 20pts
A 2.6 mol sample of N2 is held in a 4191 mL balloon at 89.9 atm. What temperature (in Celcius) is the gas at? Answer to one decimal place.
To convert to Celsius, we subtract 273.15 from the Kelvin temperature, giving us a final answer of 42.1°C.
What is temperature?Temperature is a physical quantity that measures the average kinetic energy of the particles in a system. It is an important parameter for understanding the behavior of matter and the underlying physical processes at work. Temperature is measured in units such as degrees Celsius (°C), Fahrenheit (°F), Kelvin (K), or Rankine (°R). Temperature affects the rate at which chemical reactions occur and the movement of particles in solids, liquids, and gases.
The ideal gas law states that PV = nRT,
where n is the number of moles,
P is the pressure,
V is the volume, R is the ideal gas constant (8.314 J/molK), and
T is the temperature in Kelvin.
Rearranging the equation, we get T = (PV)/(nR).
Plugging in our values, we get T = (89.9 atm * 4191 mL)/(2.6 mol * 8.314 J/molK) = 115.2 K.
To convert to Celsius, we subtract 273.15 from the Kelvin temperature, giving us a final answer of 42.1°C.
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What happens when a solid is dissolved into a liquid?
.
4- Calculate the pH of 0.3 M NH, where is K = 1.7 x 10
The pH of .3 M NH, where is K = 1.7 x 10^-5 is 11.87 calculated from the equation of dissociation constant.
How can pH be determined?Kb= [A] /[A + ][X− ]
1.7×10 −5 = x ^2 /0.3
⇒x= 7.5 ×10 −3
∴[OH − ][H + ]=7.5 ×10 −3
[H + ] =10 ^−14 ⇒pH=11.87
When describing the acidity or basicity of an aqueous solution, chemists use the pH scale, which is also known as acidity and previously stood for "potential of hydrogen". Greater pH values are seen in basic or alkaline solutions than acidic solutions.
Potential hydrogen is the meaning of the acronym pH, which indicates how much hydrogen is present in liquids and how active the hydrogen ion is.
As a first step, we shall ascertain the pKa of the solution before calculating its Ka. When a solution reaches the equivalence point, its pH and pKa are equal. So, by using a titration curve and the Ka = - log pKa equation, we may rapidly ascertain the value of Ka.
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Does anyone know how to solve this? (Picture Provided)
Therefore, the standard enthalpy change for reaction (3) is -152.6 kJ.
What is the standard enthalpy change of the reaction?To determine the standard enthalpy change for reaction (3), we can use Hess's law, which states that the overall enthalpy change for a reaction is the sum of the enthalpy changes for each step of the reaction.
We can see that reaction (1) has the same products as reaction (3) but in reverse order. We can use reaction (1) to reverse the formation of FeO:
2Fe(s) + O2(g) → 2FeO(s) ΔH° = -544.0 kJ
2FeO(s) → 2Fe(s) + O2(g) ΔH° = +544.0 kJ (reversed)
We can also use reaction (2) to form ZnO, which is a product in reaction (3):
2Zn(s) + O2(g) → 2ZnO(s) ΔH° = -696.6 kJ
Now, we can add the two reactions to get the overall reaction (3):
2FeO(s) + 2Zn(s) → 2Fe(s) + 2ZnO(s)
We add the enthalpies of the two reactions to get the enthalpy change for reaction (3):
ΔH° = (+544.0 kJ) + (-696.6 kJ)
ΔH° = -152.6 kJ
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The satellite image above shows the San Francisco area along the West Coast. What feature is marked by "X"?
A. A bay
B. A fresh water lake
C. A mountain
D. A volcano
The diagram below illustrates that the mass of an atom of element X is equivalent to the total mass of 7 hydrogen atoms. X H H H H H H X H 14
The total mass of protons and neutrons makes up an element's atomic mass. Lithium is the element X; it has a mass of 6.941 u.
What is element?When an atom has the same number of protons in its atomic nucleus, it is said to be an element. The number of protons in the nucleus of each element's atoms, or atomic number, serves as the element's sole means of identification.
Seven hydrogen atoms will weigh 7.056 g as each hydrogen atom has an atomic mass of 1.008. The periodic chart shows that an atomic mass of 7.056 g is the one that is closest to that of a lithium atom (6.941 u).
Seven hydrogen atoms have a mass comparable to one lithium atom in the periodic table, based on their mass. With an atomic mass of 6.941 g/mol, the lithium atom bears the atomic number 3.
Lithium is the name of element X.
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Liquid octane CH3CH26CH3 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. Suppose 6.9 g of octane is mixed with 42.2 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Round your answer to 2 significant digits.
The maximum mass of carbon dioxide that could be produced from 6.9 g of octane and 42.2 g of oxygen is 21.3 g, rounded to 2 significant digits.
What is Octane?
Octane is a hydrocarbon with the chemical formula [tex]C_{8} H_{18}[/tex] It is an organic compound belonging to the alkane group, which means it consists of only carbon (C) and hydrogen (H) atoms bonded together by single covalent bonds. Octane is a colorless liquid with a molecular weight of approximately 114 g/mol and is commonly used as a component in gasoline or fuel for internal combustion engines.
From the balanced equation, we know that 1 mole of octane reacts with 12.5 moles of oxygen to produce 8 moles of carbon dioxide. Therefore, 0.0605 mol of octane would require 0.0605 mol x 12.5 = 0.75625 mol of oxygen to fully react.
Since we have only 1.32 mol of oxygen, which is in excess compared to the 0.75625 mol required by octane, oxygen is the excess reactant, and octane is the limiting reactant.
Now, we can use the stoichiometry of octane to carbon dioxide to calculate the maximum mass of carbon dioxide produced:
From the balanced equation, we know that 1 mole of octane produces 8 moles of carbon dioxide.
Molar mass of carbon dioxide (CO2) = 44.01 g/mol
Maximum moles of carbon dioxide produced from octane = 0.0605 mol x 8 = 0.484 mol
Maximum mass of carbon dioxide produced from octane = 0.484 mol x 44.01 g/mol = 21.3 g
Remember to round the final answer to 2 significant digits as requested.
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[1 mole = 22.4 Liters; 1 mole = 6.02 x 10 23 atoms/molecules]
1. Determine the number of grams in 0.89 moles of carbon dioxide, CO2. Show all work.
Answer: 40. g
Explanation:
To find the grams in 0.89 moles of CO2, we just need to use the molar mass of CO2. The molar mass which tells us how many grams are in a mole for an element or compound.
The molar mass of CO2 is equal to the molar mass of carbon, 12.0107, and 2 oxygens, 2*15.9994 (you can find the molar mass of an element on any periodic table). Add these, and you get the molar mass of CO2 to be 44.01 g/mol, a helpful value to remember.
Now, just multiply the molar mass by the amount of moles to find grams.
[tex]\frac{44.01g}{mole} * 0.89mole[/tex], moles cancel out, [tex]\frac{44.01g}{mole} * 0.89mole=40.48g[/tex]
There are 2 significant figures in the question, so I will round this answer to 2 significant figures, 40. g
What happens to the pH when a a small amount of acid is added to a buffered solution?
A.the pH goes up to 14.
B.The pH goes down to 1.
C.The pH stays about the same.
D.The pH goes to 7.
C. The pH stays about the same.
A buffered solution resists changes in pH upon addition of small amounts of acid or base. The buffer system in the solution will react with the added acid, keeping the pH relatively constantAnswer:
C.The pH stays about the same.
Explanation:
Buffer reactions maintain stable pH of solutions.
In the reaction below, which species is reduced?
3Ag2S(s) + 8W(aq) + 2N03-(aq) - 6Ag+(aq) + 3S(s) + 2NO(g) + 4H20
A. Ag2S
B. H+
C. N03-
D. NO
E. S The sum of the oxidation numbers of all the atoms in the peroxydisu1fate ion, S20g2-, is
A. -2
B. +2
C. +4
D. +5
E. +6
In the peroxodisulfate ion, Peroxydisulfate-, all the atoms have oxidation values that add up to +6.
Peroxydisulfate has what purpose?Most often, the polymerization of different alkenes, such as styrene, acrylonitrile, and fluoroalkenes, is started using salts of peroxydisulfate. The homolysis of peroxydisulfate causes polymerization to begin. 2 [Peroxydisulfate] [Sulfate]
Ag: +1
Sulfur: 0
Nitrogen: +2 (in Nitric oxide)
Oxygen: -2 (in Water)
Hydrogen: +1 (in Water)
The peroxodisulfate ion, Peroxydisulfate-, consists of one disulfate (Peroxydisulfate-) group and two peroxy (Oxygen2-) groups. Normal oxygen oxidation number is 2, however in a peroxy group it is -1. The charge of the ion, which is -2, is equal to the total sum of the oxidation numbers of all the atoms in the ion. As a result, we may write:
2(-1) + 2x + 8(-2) = -2
-2 + 2x - 16 = -2
2x = 12
x = +6
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KI Which type of reaction is this equation an example of? CH3OH + O2 CO₂ + 2H₂O heat
The calcium and magnesium in a urine sample were precipitated as oxalates. A mixed precipitate of calcium oxalate (CaC2O4) and magnesium oxalate (MgC2O4) resulted and was analysed by gravimetry. The formed precipitate mixture was heated to form calcium carbonate (CaCO3) and magnesium oxide (MgO) with a total mass of 0.0433 g. The solid precipitate mixture was ignited to form CaO and MgO, the resulting solid after ignition weighed 0.0285 g. What was the mass of calcium in the original sample? All answers should be reported with the correct significant figures
The mass of calcium in the original urine sample would be 0.0140 g.
Stoichiometric problemFirst, we need to find the masses of calcium and magnesium oxalates in the original sample. Let x be the mass of calcium oxalate and y be the mass of magnesium oxalate. Then we have:
x + y = mass of the mixed oxalate precipitate
Next, we need to use the information given to find the mass of calcium in the original sample. The mass of calcium oxide formed after ignition is equal to the mass of calcium oxalate in the original sample. We can calculate the mass of calcium oxide using the mass of calcium carbonate formed and the molar mass ratio of calcium carbonate to calcium oxide.
The balanced chemical equations for the reactions are:
CaC2O4 -> CaCO3 + CO2
CaCO3 -> CaO + CO2
The molar mass of CaCO3 is 100.09 g/mol, and the molar mass of CaO is 56.08 g/mol.
From the given information, we have:
0.0433 g = (x + y)(100.09 g/mol + 80.15 g/mol) / (128.10 g/mol + 80.15 g/mol)
0.0285 g = x(56.08 g/mol) + y(40.31 g/mol)
Solving these equations simultaneously, we get:
x = 0.0140 g
y = 0.0053 g
Therefore, the mass of calcium in the original sample (which is equal to the mass of calcium oxide formed after ignition) is:
0.0140 g
So the mass of calcium in the original sample is 0.0140 g.
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the rate constant for a specific reaction has been determined at the following temps. 82 C, k= 3.97x10^-3 M^-1 x s^-1 , 125 C, k= 2.07x10^-2 ,M^-1 x s^-1. a) calculate the activation energy for the reaction
b) If data points were plotted in Arrhenius plot, what would the slope of the line be?
c) at what temp will the rate constant have k=1.00x10^-3 M^-1 x s^-1
The following formula can be used to calculate the activation energy: ln (k 1 /k 1) = É a /R x (1/S n 1 - 1/T 2). where. E an is the reaction's activation energy, expressed in J/mol.
What does a scientific reaction mean?
reaction definitions in science. reaction. one or more new compounds are formed as a result of the reorganization of the atoms and molecules of two substances when come into contact. Electrons of one material interact with all those of another to produce chemical reactions.
What chemical process changes one substance into another?
Chemical reaction is the process through which two or more compounds, known as reactants, change into one or more new ones, known as products. Chemical components or compounds make up substances. The atoms that make up the reactants are rearranged in a chemical reaction to produce various products.
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A sample of an ideal gas at 473K, 2.01bar pressure has a volume of 78.3L. The gas is allowed to expand until the pressure reaches 1.00bar. What is the final volume of gas in L?
The final volume of the ideal gas is 156.6 L.
When an ideal gas sample is let to expand?A sample of an ideal gas is allowed to expand adiabatically while producing external work (W) at first. The volume is then maintained at its new value with the help of heat Q until the pressure returns to its initial level.
We can use the combined gas law to solve this problem:
(P1 × V1) / T1 = (P2 × V2) / T2
where P1, V1, and T1 are the initial pressure, volume, and temperature, respectively, and P2 and V2 are the final pressure and volume, respectively. Since the gas is kept at a constant temperature, we can simplify this to:
P1 × V1 = P2 × V2
Plugging in the given values, we get:
2.01 bar × 78.3 L = 1.00 bar × V2
Solving for V2, we get:
V2 = (2.01 bar × 78.3 L) / 1.00 bar = 157 L
Therefore, the final volume of gas is 157 L.
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Draw both enantiomers of the following compound
Enantiomers rotate the plane of polarized light in opposite directions, and this property is used to distinguish between them in a process called optical rotation.
What are the enantiomers of a compound?Enantiomers are pairs of molecules that are non-superimposable mirror images of each other.
They are isomers, meaning they have the same molecular formula and connectivity but differ in their three-dimensional arrangement of atoms in space.
Enantiomers exhibit identical physical and chemical properties, except for their interaction with plane-polarized light (a type of light that oscillates in a single plane).
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Round to 2 significant
figures.
5,249
5,250. The number was rounded up from 5,249 because the last digit, 9, is greater than or equal to 5.
What is rounded up?Rounding up is a mathematical operation that involves increasing a number to its nearest whole number. It is commonly used when dealing with money, measurements, or statistics. When rounding up, the number is increased to the next highest whole number. For example, if a number is 6.7, it would be rounded up to 7. Rounding up is often used when dealing with exact measurements or estimates to simplify the calculations. It can also be used to make the results of a calculation easier to understand. In the case of money, rounding up can be used to round a number to the nearest dollar. This prevents dealing with fractional amounts of money. Rounding up can also be utilized in statistical analysis, such as in the calculation of mean or median. This simplifies the data and prevents dealing with fractions or decimals.
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Very quick can someone like help me
Answer:
Explanation:
dilute solutions of hydrochloric acid (HCl), sulphuric acid (H₂SO₄), and nitric acid (HNO₃) react with active metals to produce a salt and hydrogen gas.
Active metals react strongly and quickly with other elements and compounds due to the electrons in its structure and its ease of sharing the electrons with other elements.
The most active metals are found in Groups 1 and 2 of the Periodic Table (i.e. the left side), and include lithium, potassium, magnesium, and calcium. Metals such as aluminium, lead, and zinc, are less active than magnesium or calcium, but are generally still labelled as 'active'. Metals such as copper, gold, or silver are inactive and will not react.
Therefore, in the provided question, all the metals listed, except for copper, will produce a metal salt + hydrochloric acid. Copper will not react.
In general:
metal + HCl = metal chloride + H₂ metal + H₂SO₄ = metal sulphate + H₂metal + HNO₃ = metal nitrate + H₂A student performed an experiment similar to that in Section B from the
"Use and Abuse of Aluminum and Its Compounds" lab. She started with a piece of aluminum foil with a mass of 0.0432 grams. She produced 0.5987 grams of alum crystals. What was her percent yield for the experiment?
Percent yield = 1566%, The percent yield is greater than 100%, which means that the student obtained more product than the theoretical yield.
What is the actual yield and the theoretical yield in an experiment?The theoretical yield is the maximum amount of product that could be produced in a chemical reaction, based on stoichiometric calculations. The actual yield is the amount of product that is actually obtained from the reaction in a laboratory experiment.
To calculate the percent yield of the experiment, we need to compare the actual yield to the theoretical yield.
The balanced chemical equation for the formation of alum from aluminum and potassium hydroxide is:
2 Al + 2 KOH + 4 H₂O + 1/2 O₂ → KAl(SO₄)₂·12H₂O
From this equation, we can see that the mole ratio of aluminum to alum is 2:1. This means that for every 2 moles of aluminum used, we should theoretically obtain 1 mole of alum.
First, we need to convert the mass of aluminum foil used to moles of aluminum:
0.0432 g Al × 1 mol Al/26.98 g Al = 0.001600 mol Al
Next, we can use the mole ratio to calculate the theoretical yield of alum:
Theoretical yield = 0.001600 mol Al × 1 mol KAl(SO₄)₂·12H₂O/2 mol Al × 474.39 g KAl(SO₄)₂·12H₂O/1 mol KAl(SO₄)₂·12H₂O
= 0.0382 g KAl(SO₄)₂·12H₂O
Now we can calculate the percent yield:
Percent yield = actual yield/theoretical yield × 100%
Actual yield = 0.5987 g
Percent yield = 0.5987 g/0.0382 g × 100% = 1566%
The percent yield is greater than 100%, which means that the student obtained more product than the theoretical yield. This could be due to experimental error, such as incomplete drying of the crystals or loss of product during the experiment. It's also possible that the student accidentally used more aluminum foil than intended.
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why does glass containing an iced beverage feel cold
Answer:
Molecules in the skin are moving faster than molecules in the glass.
Explanation:
Put it in your own words.
Answer:
The energy from the ice transferred to the glass.
pls help!!!
a compound is found to be 51.39% carbon, 8.64% hydrogen, and 39.97% nitrogen. it has a molecular molar mass of 140.22 g/mol. what is the molecular formula.
show work pls!!
The molecular formula of the compound, given that it contains 51.39% carbon, 8.64% hydrogen, and 39.97% nitrogen is C₆H₁₂N₄
How do i determine the molecular formula?To obtain the molecular formula, we must first determine the empirical formula. Details on how to obtain the empirical formula is given beloww:
Carbon (C) = 51.39%Hydrogen (H) = 8.64%Nitrogen (N) = 39.97%Empirical formula =?Divide by their molar mass
C = 51.39 / 12 = 4.283
H = 8.64 / 1 = 8.64
N = 39.97 / 14 = 2.855
Divide by the smallest
C = 4.283 / 2.855 = 1.5
H = 8.64 / 2.855 = 3
N = 2.855 / 2.855 = 1
Multiply through by 2 to express in whole number
C = 1.5 × 2 = 3
H = 3 × 2 = 6
N = 1 × 2 = 2
Thus, we can conclude that the empirical formula is C₃H₆N₂
Finally, we shall determine the molecular formula. Details below
Empirical formula = C₃H₆N₂Molar mass of compound = 140.22 g/molMolecular formula =?Molecular formula = empirical × n = mass number
[C₃H₆N₂]n = 140.22
[(12×3) + (1×6) + (14×2)]n = 140.22
70n = 140.22
Divide both sides by 70
n = 140.22 / 70
n = 2
Molecular formula = [C₃H₆N₂]n
Molecular formula = [C₃H₆N₂]₂
Molecular formula = C₆H₁₂N₄
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How many moles is 3.4 g of HCI?
3.4 g of HCl is therefore equivalent to roughly 0.0932 moles of HCl.
What is the HCI's mole count?Since each molecule of HCl contains one mole of hydrogen and one mole of chlorine, the mole quantity of HCl equals the mole quantity of hydrogen and chlorine in the sample.
Approximately 36.46 g/mol is the molar mass of hydrochloric acid (HCl). We must divide the mass by the molar mass to determine the number of moles of HCl in 3.4 g of HCl:
Mass of HCl / molar mass of HCl equals moles of HCl.
3.4 grams per 36.46 grams per mole of HCl
A mole of HCl is equal to 0.0932 mol.
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Determine how many grams (g) of carbohydrate are in a sandwich that
contains 475 total Calories, 10 g of fat, and 25 g of protein.
The sandwich contains approximately 71.25 grams of carbohydrates.
What do you understand by the term calories?Calories are a unit of measurement used to quantify the amount of energy contained in food and beverages. The number of calories in a particular food is determined by the amounts of carbohydrates, fats, proteins, and other nutrients it contains.
To determine the number of grams of carbohydrates in the sandwich, we need to use the fact that carbohydrates, fats, and proteins have different calorie densities. Specifically, carbohydrates and proteins each contain about 4 calories per gram, while fats contain about 9 calories per gram.
First, let's calculate the total number of calories coming from the fat and protein in the sandwich:
Total calories = calories from carbohydrates + calories from fat + calories from protein
475 Calories = calories from carbohydrates + 10g x 9 Calories/g + 25g x 4 Calories/g
475 Calories = calories from carbohydrates + 90 Calories + 100 Calories
475 Calories - 190 Calories = calories from carbohydrates
285 Calories = calories from carbohydrates
Now that we know the number of calories from carbohydrates, we can use the calorie density of carbohydrates to determine the number of grams of carbohydrates:
285 Calories = carbohydrates in grams x 4 Calories/g
71.25 g = carbohydrates in grams
Therefore, the sandwich contains approximately 71.25 grams of carbohydrates.
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The oxides SO2 and N2O5 will form what acids?
A reaction has a standard free‑energy change of −17.40 kJ mol−1(−4.159 kcal mol−1).
Calculate the equilibrium constant for the reaction at 25 °C.
eq=
At 25 oC, the reaction's equilibrium constant is Cu(s) + 2Ag+ (aq) Cu+2 (aq) + 2Ag. (s). Eocell is equal to 0.47 V, R is 8.134 JK-1, and F is 96500 C at 25oC.
What is the antilog of four?Antilogarithm is the value that a certain logarithm represents. For instance, x corresponds to the antilogarithm for y if log x = y. An antilogarithm of the stated number is an integer whose logarithm equals the specified number. Since 10,000 (104) has a logarithm of 4, 10,000 has an antilogarithm of 4.
Antilog of 7.06 with K equal to 1164
You must calculate K using the relationship Go = -RTlnK. In this example, 8.315 j K-1mol-1 should be used as R, therefore lnK = Go/ -RT = -17.5 x 103 jmole-1 / (-8.315 j K-1mol-1 x 298 °K) = 7.06
An antilog on a calculator is what?
By elevating a logarithm above its base, one can find an antilog, which is the opposite of a logarithm. For instance, 10y = 5 is the antilog with y = log10(5). If y = ln(x), where y is time, and x is the value that needs to grow, then the natural logarithm can be used to determine how long it will take to reach a particular level of growth.
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