C8H16O8
Explanation:
(CH2O)n=240.2
=12n+2n+16n=240.2
=30n=240.2
n=8
C8H16O8
When 3.915 grams of a hydrocarbon, CxHy, were burned in a combustion analysis apparatus, 12.74 grams of CO2 and 3.913 grams of H2O were produced. In a separate experiment, the molar mass of the compound was found to be 54.09 g/mol. Determine the empirical formula and the molecular formula of the hydrocarbon.
Answer: The empirical formula and the molecular formula of the hydrocarbon is [tex]C_2H_3[/tex] and [tex]C_4H_6[/tex] respectivley.
Explanation:
The chemical equation for the combustion of hydrocarbon having carbon, hydrogen and oxygen follows:
[tex]C_xH_y+O_2\rightarrow CO_2+H_2O[/tex]
where, 'x', 'y' are the subscripts of Carbon, hydrogen
We are given:
Mass of [tex]CO_2[/tex] = 12.74 g
Mass of [tex]H_2O[/tex]= 3.913 g
Molar mass of carbon dioxide = 44 g/mol
Molar mass of water = 18 g/mol
For calculating the mass of carbon:
In 44g of carbon dioxide, 12 g of carbon is contained.
So, in 12.74 g of carbon dioxide, =[tex]\frac{12}{44}\times 12.74=3.474g[/tex] of carbon will be contained.
For calculating the mass of hydrogen:
In 18g of water, 2 g of hydrogen is contained.
So, in 3.913 g of water, =[tex]\frac{2}{18}\times 3.913=0.435g[/tex] of hydrogen will be contained.
Mass of C = 3.474 g
Mass of H = 0.435 g
Step 1 : convert given masses into moles.
Moles of C =[tex] \frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{3.474g}{12g/mole}=0.289moles[/tex]
Moles of H=[tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{0.435g}{1g/mole}=0.435moles[/tex]
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For C =[tex]\frac{0.289}{0.289}=1[/tex]
For H =[tex]\frac{0.435}{0.289}=1.5[/tex]
The ratio of C : H = 1: 1.5
The whole number ratio will be = 2: 3
Hence the empirical formula is [tex]C_2H_3[/tex].
The empirical weight of [tex]C_2H_3[/tex] = 2(12.01)+3(1.008)= 27.04 g.
The molecular weight = 54.09 g/mole
Now we have to calculate the molecular formula.
[tex]n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{54.09}{27.04}=2[/tex]
The molecular formula will be=[tex]2\times C_2H_3=C_4H_6[/tex]
Kidney stones generally form from the double displacement reaction of two salts that form an insoluble compound, a precipitate. (Read through the background for Week 1 for more information.) which of the following salts will participate in a double displacement reaction with Na3PO4 to form an insoluble compound(s): __________
Ca(NO3)2
(NH4)2SO4
NaCl
KNO3
Answer: [tex]Ca(NO_3)_2[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
A double displacement reaction in which on e of the product is formed as a solid is called as precipitation reaction.
The balanced chemical equation for a precipitation reaction is:
[tex]2Na_3PO_4(aq)+3Ca(NO_3)_2(aq)\rightarrow Ca_3(PO_4)_2(s)+6NaNO_3(aq)[/tex]
The salt that should be participated in the double displacement reaction should form the insoluble compound(s) i.e. Ca(NO3)2.
What is a double displacement reaction?It is the one where the ions should be exchanged. The salts should be soluble in water that should be designated by symbol and can be insoluble in water also same in the solid form. The same should be presented by (s) when the chemical formulas are mentioned. Also, it is one of the product that should be created known as the precipitation reaction.
Learn more about compound here: https://brainly.com/question/14700099
Consider the following exothermic process at equilibrium:
CO(g)+H2O(g)⇌CO2(g)+H2(g)
Which of the following changes would increase the amount of H2(g) present in the equilibrium mixture?
Consider the following exothermic process at equilibrium:
Which of the following changes would increase the amount of present in the equilibrium mixture?
decrease the temperature
increase [CO2]
increase [CO]
increase the volume of the container in which the reaction occurs.
more than one of the above
(Answer is not increase [CO])
For the given exothermic process at equilibrium, an increase in the concentration of CO would increase the amount of H₂.
How is equilibrium affected by changes?When a perturbation is done on a system at equilibrium, it shifts its equilibrium position to counteract the perturbation.
Let's consider the following exothermic process at equilibrium.
CO(g) + H₂O(g) ⇌ CO₂(g) + H₂(g)
Which of the following changes would increase the amount of H₂(g) present in the equilibrium mixture?
decrease the temperature. NO. For an exothermic reaction, a decrease in the temperature will shift the equilibrium towards the reactants.increase [CO₂]. NO. This would shift the equilibrium towards the reactants.increase [CO]. YES. This would shift the equilibrium towards the products.increase the volume of the container in which the reaction occurs. NO. This wouldn't affect the equilibrium since the number of gaseous moles is the same on both sides.more than one of the above. NO.For the given exothermic process at equilibrium, an increase in the concentration of CO would increase the amount of H₂.
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Can somebody please answer this for me
4NH3+6NO --> 5N2 + 6H20
When a student runs this reaction in their chemistry lab, they notice that they run out SO quickly and some NH3 is left in the container. Which reactant is the limiting reactant?
N2
NH3
NO
water
Answer:
NO
Explanation:
4 NH₃ + 6 NO → 5N₂ + 6H₂OWater and N₂ cannot be the answer because they are products of the reaction, not reactants.
The fact that some ammonia (NH₃) is left in the container once the reaction is finished tells us that NH₃ is the reactant in excess.
The remaining reactant is thus the limiting reactant. The correct answer is NO.
Single-use earplugs require a professlonal fitting before they can be used.
A) True
B) False
Answer:
The answer is false
Explanation:
Because i am taking this safety test and i got that question right ong
What geologic process creates a stack?
a.river erosion
b.tectonic activity
c.wave erosion
d.glaciation
Answer:
c.wave erosion=>A stack or sea stack is a geological landform consisting of a steep and often vertical column or columns of rock in the sea near a coast, formed by wave erosion.
A bolt of lightning is an example of static discharge.
TRUE
FALSE
Answer:
True
Explanation:
The product of the molarities of the dissolved ions, raised to a power equal to the ion's coefficient in the balanced chemical equation. Choose... The mass of a salt in grams that will dissolve in 100 mL of water. Choose... A solution that has dissolved the maximum amount of a compound at a given temperature. Any further addition of salt will remain undissolved. Choose... A decrease in the solubility of an ionic compound as a result of the addition of a common ion. Choose... The maximum number of moles of a salt that will dissolve in 1 L of solution. Choose...
Answer:
Solubility product constant
Solubility
Saturated Solution
Common ion effect
Molar Solubility
Explanation:
If i have the ionic compound KNO3 for instance; the solubility product of the compound is the product of the molarities of the dissolved ions, raised to a power equal to the ion's coefficient in the balanced chemical equation.
E.g
KNO3(s) ------> K^+(aq) + NO3^-(aq)
Ksp = [K^+] [NO3^-]
The solubility of any given substance is defined as mass of the substance in grams that dissolves in 100 mL of water.
A saturated solution is one that has dissolved the maximum amount of solute at a given temperature. If more solute is added, it will not dissolve.
If i add AgCl to a solution of HCl, the solubility of AgCl in HCl solution is found to be less than its solubility in pure water because of the presence of a common Cl^-. Hence, common ion effect is a decrease in the solubility of an ionic compound as a result of the addition of a common ion to the solution.
The molar solubility of a substance is defined as the maximum number of moles of a substance that will dissolve in 1 L of solution.
The terms used to describe the followings are:
Solubility product constantSolubilitySaturated SolutionCommon ion effectMolar SolubilityWhat is molarity?
The molarity is the concentration unit used for the determination of the moles of solute in the liter of solution.
The product of the concentration of the ions raised to the stoichiometric coefficient gives the solubility product constant for the compound.For example:
[tex]\rm H_2A\;\rightarrow\;2H^+\;+A^-\\Solubility\;product\;constant=[H^+]^2[A^-][/tex]
The solubility can be defined as the mass of the salt that can be dissolved in 100 mL of water.The solution with the maximum amount of salt dissolved at a certain temperature is termed the saturated solution. Further addition of the solute results in the precipitation of the solute in the solution.
The addition of the compounds with the common ion as the salt results in an increased concentration of the salts in the solution and the solubility will be decreased.The effect raised with the addition of the common ions is termed the common ion effect.
The molar solubility is the maximum moles of the salt that can be dissolved in the liter of the solution.Learn more about molarity, here:
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d. Explain why hydrogen produces three light in spectrometer
Answer:
Though a hydrogen atom has only one electron, it contains a large number of shells, so when this single electron jumps from one shell to another, a photon is emitted, and the energy difference of the shells causes different wavelengths to be released. Hence, mono-electronic hydrogen has many spectral lines.
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The pressure of an ideal gas stays constant at 2.57 atm.
This ideal gas has a volume of 45.8 mL when it is at a
temperature of 37.0°C. What temperature will this ideal gas
be at when it contracts to 32.5 mL?
Answer:
[tex]T_2=-53.15\°C[/tex]
Explanation:
Hello there!
In this case, in agreement to the Charles' law which states that the volume and temperature relate to each other via a directly proportional relationship at constant pressure, we can write:
[tex]\frac{T_2}{V_2} =\frac{T_1}{V_1}[/tex]
Thus, given V1, V2 and T1 (310 in Kelvin), we can solve for the final temperature as shown below:
[tex]T_2=\frac{T_1V_2}{V_1} \\\\T_2=\frac{310K*32.5mL}{45.8mL}\\\\T_2=220 K-273.15K\\\\T_2=-53.15\°C[/tex]
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chemistry in formula of water
Answer: Unbalanced : H2O
Balanced : 2H2O
Explanation:
plzz mark as brainliest
H2O
Explanation:
Water (chemical formula: H2O) is a transparent fluid which forms the world's streams, lakes, oceans and rain, and is the major constituent of the fluids of organisms. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds.
There are three types
of atoms, which on gains and looses electrons?
Answer:
https://courses.lumenlearning.com/boundless-biology/chapter/atoms-isotopes-ions-and-molecules/
Explanation:
How are a tundra and a desert different?
A desert has a low level of precipitation and a tundra has a high level of precipitation.
A desert is wet year-round and a tundra is dry.
A tundra has a lower levels of humidity.
A tundra has lower average temperatures year-round.
i am giving brainlyest!!!!!!!
Answer:
A tundra has a lower average temperatures year-round.
Please help for brainliest
Don’t skip and don’t answer if u don’t know.
Answer:
burning wood be a chemical change because it wouldn’t be able to go back to its original form. A physical change would be a broken pencil. The pencil is still a pencil, it’s just a physical change.But if it were burned it would be a chemical change.
Explanation:
A sample of hydrogen has an initial temperature of 122.0 °F. When the temperature is lowered to -23.0 °F, the volume of hydrogen becomes 212 cm3. What was the initial volume of the hydrogen?
Answer: The initial volume of gas was [tex]282cm^3[/tex]
Explanation:
Charles's Law: This law states that volume is directly proportional to temperature of the gas at constant pressure and number of moles.
[tex]V\propto T[/tex] (At constant pressure and number of moles)
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
where,
[tex]V_1[/tex] = initial volume of gas =?
[tex]V_2[/tex] = final volume of gas = [tex]212cm^3[/tex]
[tex]T_1[/tex] = initial temperature of gas = [tex]122.0^0F=323.15K[/tex]
[tex](32^0C=273.15K)[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]-23.0^0F=242.59K[/tex]
[tex]\frac{V_1}{323.15}=\frac{212}{242.59}[/tex]
[tex]V_2=282cm^3[/tex]
Therefore, the initial volume of gas was [tex]282cm^3[/tex]
How many grams of aluminum chloride are produced when 5.96 grams of aluminum are reacted with excess chlorine gas? Start with a balanced equation.
Answer:
29.47 g of AlCl₃.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2Al + 3Cl₂ —> 2AlCl₃
Next, we shall determine the mass of Al that reacted and the mass of AlCl₃ produced from the balanced equation. This can be obtained as follow:
Molar mass of Al = 27 g/mol
Mass of Al from the balanced equation = 2 × 27 = 54 g
Molar mass of AlCl₃ = 27 + (35.5× 3)
= 27 + 106.5
= 133.5 g/mol
Mass of AlCl₃ from the balanced equation = 2 × 133.5 = 267 g
SUMMARY:
From the balanced equation above,
54 g of Al reacted to produce 267 g of AlCl₃.
Finally, we shall determine the mass of AlCl₃ produced by the reaction of 5.96 g of Al. This can be obtained as follow:
From the balanced equation above,
54 g of Al reacted to produce 267 g of AlCl₃.
Therefore, 5.96 g of Al will react to produce = (5.96 × 267)/54 = 29.47 g of AlCl₃.
Thus, 29.47 g of AlCl₃ were obtained from the reaction.
predict the product of the following reaction Ba + P
How many moles of methane gas are present in 425 L of the gas? Round answer to 3 significant figures.
Answer:
No. of moles of methane = 18.9 mol
Explanation:
No. of moles = Volume of gas / Volume of gas (at STP)
Volume of gas at STP (Standard Temperature and Pressure) = 22.4L
N = 425 / 22.4
N = 18.973
∴No. of moles of methane = 18.9 mol
Can someone help me please
Answer:
(14)The pH is 8.3 and is basic
(15) pOH = 11.0 The solution is acidic
Explanation:
(14) From the question,
pH = -log[H₃O⁺]............... Equation 1
Given: H₃O⁺ = 5.6×10⁻⁹ M
Substitute the value above into equation 1
pH = -log[5.6×10⁻⁹]
pH = 8.3
The pH is 8.25 and is basic.
(15)
pOH = -log[OH⁺]................ Equation 2
Given: [OH⁺] = 8.34×10⁻¹² M
Substitute into equation 2
pOH = -log[8.34×10⁻¹²]
pOH = 11.0 Hence the solution is acidic
What occurs during interphase? (Select all that apply.)
cells store up energy
cells produce eight daughter cells
cells take in nutrients
cells grow
Answer:
during interphase the cells start to grow
cells grow, store up energy, and take in nutrients
hope it helped :)
If I place a pot of water over a fire (heat source), what will happen to the water?
None of the water will get warm.
All of the water will get warm.
Only the water on top will get warm.
Only the water closest to the source will get warm
Answer:
C. All of the water will get warm.
Explanation:
The water will get warm all together but slowly, eventually when it hits a certain high heated temperature it will start to boil.
Determine the mass in grams of 4.69 x 1021 atoms of barium. (The
mass of one mole of barium is 137.33 g.)
Answer:
1.07 g Ba
Explanation:
Hello there!
In this case, according to the definition of the Avogadro's number and the molar mass, it is possible to say that 6.022x10^{23} atoms of barium equal one mole, and at the same time, 1 mole equals 137.327 grams of this element; thus, it is possible to say that 6.022x10^{23} atoms of barium have a mass of 137.327 grams; therefore, it i possible for us to calculate the required mass in grams as shown below:
[tex]4.69x10^{21}atoms*\frac{137.327gBa}{6.022x10^{23} atoms} \\\\=1.07gBa[/tex]
Best regards!
Can somebody please help me!!!
Answer:
speed
Explanation:
Speed is the rate at which something moves. The speed of light is faster than the speed of sound.
A student ran the following reaction in the laboratory at 1100 K: 2SO2(g) O2(g) 2SO3(g) When he introduced SO2(g) and O2(g) into a 1.00 L evacuated container, so that the initial partial pressure of SO2 was 3.43 atm and the initial partial pressure of O2 was 1.61 atm, he found that the equilibrium partial pressure of O2 was 0.809 atm. Calculate the equilibrium constant, Kp, she obtained for this reaction.
Answer:
Kp = 0.949
Explanation:
Hello there!
In this case, according to the given chemical reaction:
[tex]2SO_2(g) +O_2(g) \rightleftharpoons 2SO_3(g)[/tex]
It is possible to set up the equilibrium expression as shown below:
[tex]Kp=\frac{p_{SO_3}^2}{p_{SO_2}^2p_{O_2}}[/tex]
Whereas the initial pressure of SO2 was 3.43 atm and that of O2 was 1.61 atm. Now, since the partial pressure of O2 decreased to the 0.809 atm, it is possible to calculate the change in the pressure of O2 via:
[tex]x=1.61atm-0.809atm=0.801atm[/tex]
Which is actually applied to SO3 and SO2 according to the stoichiometry in the equilibrium expression to calculate Kp:
[tex]Kp=\frac{(2*x)^2}{(3.43-2x)^2(0.809)}[/tex]
Thus, by plugging in x, we obtain:
[tex]Kp=\frac{(2*0.801)^2}{(3.43-2*0.801)^2(0.809)}\\\\Kp=0.949[/tex]
Best regards!
An ideal gas is contained in a closed assembly with an initial pressure and
temperature of 250 kN/m²and 75°C respectively, If the final volume of the system
is increased 1.8 times and the temperature drops to 18°C, determine the final
pressure of the gas.
Answer: The final pressure is 116kPa or [tex]116kN/m^2[/tex]
Explanation:
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = [tex]250kN/m^2=250kPa[/tex] [tex](1kN/m^2=1kPa)[/tex]
[tex]P_2[/tex] = final pressure of gas = ?
[tex]V_1[/tex] = initial volume of gas = v ml
[tex]V_2[/tex] = final volume of gas = [tex]1.8\times v=1.8vml[/tex]
[tex]T_1[/tex] = initial temperature of gas = [tex]75^0C=(75+273)K=348K[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]18^0C=(18+273)K=291K[/tex]
Now put all the given values in the above equation, we get:
[tex]\frac{250kPa\times v}{348}=\frac{P_2\times 1.8v}{291}[/tex]
[tex]P_2=116kPa[/tex]
The final pressure is 116kPa or [tex]116kN/m^2[/tex]
An unknown substance turns blue litmus paper to red. Which additional test could be used to confirm the substance’s identity?
It should turn phenolphthalein from colorless to pink because it is a base.
It should turn phenolphthalein from pink to colorless because it is a base.
It should turn methyl orange to orange because it is an acid.
It should turn methyl orange to red because it is an acid.
Answer:
D
Explanation:
what is the formal charge in SeCl4?
name the following substances
KCl
FeCl2
CuSO4
Al2O3
Fe2O3
Potassium chloride
Iron (II) chloride
Copper (II) sulfate
Aluminum oxide
Iron (III) oxide
Remember to put roman numerals for the compounds where the metal has more than one possible oxidation state. For example, you see iron here with a +2 charge in one compound and then +3 charge in another. If the metal only has one possible oxidation state (like potassium and aluminum), you don't need a roman numeral.
How is motion involved in your lives?
Answer:
By walking and stuff, duh.
Explanation:
We walk, motion.
We drive, motion.
We eat, motion.
We talk, motion.
In solution, strong acids and bases ionize completely, but weak acids and bases ionize only partially.
Answer:
A weak acid is one that does not dissociate completely in solution; this means that a weak acid does not donate all of its hydrogen ions (H+) in a solution. ... Therefore, the concentration of H+ ions in a weak acid solution is always less than the concentration of the undissociated species, HA.
Explanation:
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