If a gas had an initial temperature od 20.65 C and a final temperature of 41.77 C, its initial volume would be 7.979.
How are volume and example used?The volume of any solid in three dimensions is equal to the area it occupy. These solids include shapes like a cube, cuboid, conical, cylinder, and sphere. The form affects how much volume there is.
What does a gas' volume mean?The space occupied by the gaseous particles under typical pressure and temperature circumstances is referred to as the volume of gas. It has the symbol "V." The symbol for volume in the SI is "liters," or "L". When the gas is at normal temperature, a mole has a volume of 24 m3, or 24 000 cm3. The molar volume of a gas is this quantity.
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I do not understand and need help with an explanation please
The heat of combustion for the unknown hydrocarbon when1 mole of an unknown hydrocarbon is burned in a bomb calorimeter and the Calorimeter increases in temperature by 12.19°C is -611.26kJ/mol
What is a bomb calorimeter?A device that is mostly used to measure combustion temperatures. The reaction occurs in a sealed area known as the calorimeter proper, in constant thermal contact with its surroundings (the jacket).
To calculate the heat of combustion we follow the given steps:
Heat released by the combustion =Cp×ΔT=1.929×12.19 kJ=23.51 kJ
Hence, ΔH=−23.51 kJ/g
A unknown hydrocarbon has an empirical formula of CH and a molar mass of 26 g/mol.
So, ΔH combustion=−23.51×26g /mol=−611.26kJ/mol
Hence, ΔH combustion=−15.6×180 kJ/mol=−611.26kJ/mol
ΔH combustion=−611.26kJ/mol
Hence, the heat of combustion for the unknown hydrocarbon when1 mole of an unknown hydrocarbon is burned in a bomb calorimeter and the Calorimeter increases in temperature by 12.19°C is -611.26kJ/mol
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consider the ground state electron configurations of the following atoms and ions: a. n b. s c. ni d. cl- e. ti3 c. which atom or ion has the most valence electrons? e. which atom or ion has the fewest valence electrons? a. which atom or ion has the most unpaired electrons? d. which atom or ion has the fewest unpaired electrons?
The most valence electron is present in Cl. The fewest valence electrons are present in Ni and Ti. The most unpaired electrons are present in N. The fewest unpaired electrons are present in Cl.
What are valence electrons?
Valence electrons are the electrons present in the outermost shell of an atom that participate in formation of a chemical bond. For example, oxygen atom has total of six valence electrons. out of those 2 electrons are in the 2s subshell and 4 electrons are present in the 2p subshell. So the electronic configuration of oxygen atom can be written as 1s2 2s2 2p4.
Cl has 7 valence electrons in it. Ni and Ti have 2 valence electrons in them which is the least among the following. There are 3 unpaired electrons present in N atom which is the highest among the following atoms and Cl has 1 unpaired electron which is the lowest among the following atoms.
Therefore, the most valence electron is present in Cl. The fewest valence electrons are present in Ni and Ti. The most unpaired electrons are present in N. The fewest unpaired electrons are present in Cl among the following atoms.
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How is the bent geometry related to the trigonal planar geometry?
They are related through the trigonal planar being the electron geometry and bent is the molecular geometry for an element that has two bonds and one lone pair.
What is Geometry?This is referred to as the study of different types of shapes, figures and sizes and is used in various fields such as mathematics, chemistry etc.
In the field of chemistry, there are different types such as trigonal planar and the bent geometry which are related as a result of some shared characteristics which include the following in the subsequent paragraph.
They are related through the trigonal planar being the electron geometry and bent is the molecular geometry for an element that has two bonds and one lone pair and is therefore the correct choice in this scenario.
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how many atoms of sulfur are in 60.0 g of aluminum sulfide, al2s3? molar masses: al: 27.0 g/mol s: 32.1 g/mol
There are [tex]1.77 * 10^{24}[/tex] atoms of sulfur in 60.0 g of aluminum sulfide.
How do you calculate the number of atoms in a gram?
To get the answer in grams, divide the element's relative atomic mass by Avogadro's number. The same method can be used to determine a molecule's mass. Add up all the atomic masses in the chemical formula in this situation and divide by Avogadro's constant.What is the purpose of aluminum sulfide?
Hydrogen sulfide is made with the help of aluminum sulfur. The chemical industry uses it most frequently. It is employed in the production of cathodes. It is used to create structures for nano-networks.To learn more about Aluminum sulfide, follow the link https://brainly.com/question/5390765
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determine the volume in ml of a 0.505 m naoh solution required to titrate 40 ml of 0.25 mh2 so4 solution
The volume of required NaOH is 39.6 ml
What is normality?According to the standard definition, normality is expressed as the number of grams or molar equivalents of solute present in one liter of solution. When we say equivalent, this is the number of moles of reactive moieties in the compound.
Base acidity describes the number of ionizable hydroxide groups in the base. NaOH has an ionizable hydroxide group. Hence, the normality of NaOH is 0.5125 N.
For the given case,
N₁V₁ = N₂V₂
Normality = Molarity × Basicity
For H₂SO₄ the basicity is 2
N₂ = 0.25 × 2
= 0.5 N
For NaOH the acidity is 1
N₁ = 0.505 × 1
= 0.505 N
N₁V₁ = N₂V₂
0.505 × V₁ = 0.5 × 40
V₁ = 39.6 ml
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A student was asked to formulate a hypothesis about what would happen if 100. mL of 0.1 M NaOH(aq) at
25°C was combined with 100. mL of 0.1 M MgCl₂(aq) at 25°C. Which of the following hypotheses indicates
that the student thought a chemical change would occur?
Answer:
There will be the formation of a Common salt (NaCl) and Mg(OH)2 which is a base after the reaction between the two chemicals
Two magnets push away from
each other and do not attract.
What do we know to be true and
what type of force is being
demonstrated?
write 2 or more sentences
When two magnets are repelling each other, the following are true:
They are faced each with similar poles (negative + negative or positive + positive).When two magnets are placed with similar poles, the lines of force are in opposing directions and must repel one another.What are magnets?
A magnet is a substance or item that generates a magnetic field. This magnetic field is invisible, but it is responsible for a magnet's most remarkable property: a force that attracts or repels other ferromagnetic elements such as iron, steel, nickel, cobalt, and so on.
Magnets are classified into three types: perpetual magnets, temporary magnets, and electromagnets. Permanent magnets produce a magnetic field without requiring any external magnetism or electrical power.
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Which of the following are spectator ions in the equation below? Select all that apply
Pb(C₂H302)2(ag) + 2 LiCl(ag) 2 LIC₂H302(ag) + PbCl2(s)
Pb2+(aq)
Li+(aq)
Cl-(aq)
C2H3O-2(aq)
I hope i entered the answer options right
the salad is physical or chemichal change
Answer:
physical change
Explanation:
bcoz we make salad with raw vegetables and fruits
The salad is a physical change.
Making a fruit salad with raw fruits is a physical change because in this process chemical composition of fruits is not changed.
Telling the difference between a chemical change and a physical change seems trickier than it is. The main difference between a chemical change and a physical change is what happens to a substance’s composition. Here are the basic definitions of chemical and physical changes:
chemical change – a process in which chemical bonds are broken or created to make a new substance
physical change – a process in which a substance changes its state of matter, but chemical bonds stay intact
When matter undergoes a chemical change, it can’t return to its original state without additional reactions. But when it undergoes a physical change, it only needs to return to its original state of matter. The molecules of the substance haven’t been changed at all.
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at 1 atm pressure the heat of sublimation of gallium is 277 kj/mol and the heat of vaporization is 271 kj/mol. how much heat is required to melt 0.500 mol of gallium at 1.00 atm pressure?
At 1 atm pressure the heat of sublimation of gallium is 277 kJ/mol and the heat of vaporization is 271 kJ/mol. heat is required to melt 0.500 mol of gallium at 1.00 atm pressure is 3 kJ.
The data given as follows :
The heat of sublimation of gallium = 277 kJ/mol
The heat of vaporization = 271 kJ/mol
The difference between the heat of sublimation of gallium and the heat of vaporization is given as :
ΔH = heat of sublimation - heat of vaporization
ΔH = 277 kJ/mol - 271 kJ/mol
ΔH = 6 kJ/mol
The heat required = n ΔH
= 0.500 × 6
= 3 kJ
Thus, At 1 atm pressure the heat of sublimation of gallium is 277 kJ/mol and the heat of vaporization is 271 kJ/mol. heat is required to melt 0.500 mol of gallium at 1.00 atm pressure is 3 kJ.
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boron has two isotopes; boron-10 and boron-11. which is more abundant, given that the atomic mass of boron is 10.81?
Given that boron has an atomic mass of 10.81 amu, which is closer to 11 than 10, boron-11 is more common. This indicates that boron-11 is more prevalent.
What is atomic mass ?The quantity of protons and neutrons in a specific element's nucleus is known as the atomic mass. This number of electrons in an object's nucleus is often indicated by its atomic number. It is an element's typical weight. The mass of the neutrons and protons can be added to determine the isotopes of an atom in an element.
Why do we use atomic mass?The term "atomic mass" refers to the weight of a molecule or atom. To determine the average weight of elements and macromolecules as well as to resolve stoichiometry issues, the number of protons is used.
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how many valence electrons does each of these four elements have? how do you know? a) aluminum (al), b) fluorine (f), c) sodium (na), and d) calcium (ca)
What is the mass in gram of carbon atoms in 4.4g of C3H8 ?
Help ASAP
I'LL MARK BRAINLIEST
3. if a nitrogen atom contains only single bonds to 2 h atoms and one cl atom, how many bonding electrons are assigned to the n atom when calculating the oxidation number?
There are 14 valence electrons assigned to the n atom.as it forms NH4CL lewis structure.
Lewis structure can be explained the bonding pair from the lone pair electrons.it shows non bonding electrons.hydrogen atom form one covalent bond.cl is anionic monoatomic ligand. H is a diatomic anionic ligand. Nitrogen is the least electronegative atom goes at the center.Hydrogen atoms always go on the outside of lewis structure.
In this, N has 5 valence electron.Hydrogen has 1 and cl has 7 valence electron.that gives total 14 valence electrons.cl has 3 lone pairs and n has a lone pair..
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according to dalton, if 6g of carbon react with 17 g of hydrogen, how many grams of carbon combine with 85 g of hydrogen?
Considering Dalton's theory 30 grams of Carbon combines with 85 grams of hydrogen.
Daltons theory is based on the law of conservation of mass and also the law of constant composition. The first part of his theory states that all matter is made up of atoms, and these atoms are indivisible. The second part of this theory says that atoms of a given element are identical in mass and also in properties. But it will be different only in case of different types of molecules present together.
According to Daltons theory if 6 grams of Carbon is reacting with 17 grams of Hydrogen then for 85 grams of Hydrogen the amount of carbon required will be
⇒ 6 × 85 = 30
17
Therefore 30 grams of Carbon is required to combine with 85 grams of Hydrogen.
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What is the mass in grams of 5.90 mol C6H12?
The mass, in grams, of 5.90 mol [tex]C_6H_{12[/tex] would be 495.6 grams.
Number of moles of substanceThe number of moles in a given amount of substance is the ratio of the mass of the substance and its molar mass.
The statement of the number of moles of substances can be mathematically expressed as follows:
Mole = mass/molar mass
Making molar mass the subject, the equation becomes:
Molar mass = mass/mole
Making mass the subject, the equation becomes:
Mass = mole x molar mass.
In this case, we are looking for the mass of a given mole of [tex]C_6H_{12[/tex].
C = 12 g/mol
H = 1 g/mol
Molar mass of [tex]C_6H_{12[/tex] = (6x12) + (12x1)
= 72 + 12
= 84 g/mol
Hence:
Mass of 5.90 mol [tex]C_6H_{12[/tex] = 5.90 x 84
= 495.6 grams
In other words, 5.90 mol of [tex]C_6H_{12[/tex] would be equivalent to 495.6 grams of the compound.
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based on a kckck c value of 0.200 and the given data table, what are the equilibrium concentrations of xyxy , xx , and yy , respectively?
The Equilibrium concentrations :
[XY] = 0.268 M
[X] = 0.232 M
[Y] = 0.232 M
Solution:
XY ⇔ X + Y
0.2 + x 0.3-x 0.3 - x
Kc = [X][Y]/[XY]
0.200 = (0.3-x)^2 / 0.2 + x
0.04 + 0.2 x = 0.09 + x^2 - 0.6 x
x^2 - 0.8 x + 0.05 = 0
x = 0.732 or x = 0.0683
Equilibrium concentrations :
[XY] = 0.268 M
[X] = 0.232 M
[Y] = 0.232 M
When both the reactants and products are at concentrations that do not change over time, they are said to be in chemical equilibrium. In this state, the forward reaction rate is equal to the reverse reaction rate. A chemical is said to have equilibrium concentrations when the products and reactants do not change with time.
In other words, chemical equilibrium or equilibrium concentration is the state in which the rate of the forward reaction in a chemical reaction equals the rate of the reverse reaction. Equilibrium is when the rate of the forward reaction equals the rate of the reverse reaction. All extract and product concentrations are constant at equilibrium.
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for the titration of 20.00 ml of 0.500 m hcl with 0.500 m naoh: (2.5 pts) a. write the equation for the reaction taking place during the titration: b. calculate the ph before the addition of naoh: c. calculate the ph after the addition of 10.00 ml of 0.500 m naoh: d. calculate the ph after the addition of 20.00 ml of 0.500 m naoh: e. calculate the ph after the addition of 20.20 ml of 0.500 m naoh:
(a) The balanced chemical equation is -
NaoH + Hcl - Nacl + H2O
(b) For the pH before addition of NaoH, we need
pH = log [H+]
= -log [0.5]
=-(-0.3)
=0.3
The pH of the solution before addition of NaoH is 0.3
(c) Mole of NaoH = 0.5 x 10 = 5molar
Mole of Hcl = 0.5 x 20 = 10mili molar
Unreacted moles of Hcl = 10 -5 = 5 moles.
Total volume = 20 +10 = 30 ml
Molarity = 5 moles / 30ml = 0.166
pH = -log (0.166) = 0.77
(d) Moles of NaoH = 20 X 0.5 = 10 milli molar.
Therefore, Hcl consumed = 10 milli mole.
pH of water = [H+] = 10^-7 molar.
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TRUE OR FALSE equilibrium constant (Keq) is the ratio of the mathematical concentration products over reactants.
Answer: True
Explanation: The value of the equilibrium constant indicates whether or not a reaction is favorable. Reactions for which Keq is greater than one are favorable, meaning that the reactants are higher in energy than the products and signifying that energy is released as the reaction proceeds.
Which of the following descriptions apply to valence electrons?
Select all that apply.
They are electrons in the highest occupied principal energy level of an atom.
They participate in chemical bonds.
They do not determine how reactive an atom will be.
They must always be paired with another electron.
They were electrons in an atom's greatest primary energy level, which is occupied. In chemical bonds, they take part.
How do chemical bonds work?Atoms in molecules are held together by chemical bonds. Electrostatic forces between negatively charged electrons and positively charged atomic nuclei, whose locations in space are governed by quantum mechanics, give rise to bonds.
What makes chemical bonds so crucial?One of the most fundamental principles of chemistry, chemical bonding helps to explain other ideas like molecules and reactions. Without it, scientists would be unable to explain why atoms are drawn to one another or how products are created during a chemical process.
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A chemist burns isopropyl alcohol (C3H8O) according to the following equation: C3H8O + 3 O2 → 3 CO + 4 H2O If he burns 275 grams of C3H8O in excess oxygen, how many grams of water will be made?
Answer:
329.8g of H2O are produced
Explanation:
You have to do stoichiometry to convert grams of isopropyl alcohol to grams of water.
Convert grams of isopropyl alcohol to moles of isopropyl alcohol (use molar mass of isopropyl alcohol) Convert this to moles of water using molar coefficients Convert moles of water to grams (use molar mass of water)calculate the theoretical yield of all products when 18.9 grams of lithium phosphate reacts with excess gold (i) acetate
The yield of products formed is:
gold phosphate equals 111.93 grams and the yield of lithium acetate 32.30 grams.
This theoretical yield can be calculated as:
Molar masses of reactants and products that they need. lithium phosphate equals 115.79 grams per mole. Mass of gold phosphate equals 685.87 grams per mole and the molar mass of lithium acetate equals 65.98 grams per mole. Using number of moles and mass of substance produced we can calculate the products formed.
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30.00 ml of a h2so4 solution with an unknown concentration was titrated to a phenolphthalein endpoint with 44.45 ml of a 0.1489 m naoh solution. what is the concentration of the h2so4 solution?
The concentration of the H2SO4 solution should be 0.1101 M.
Calculation of the concentration:
Since
Volume of H2SO4 = 30.00 mL = 0.030 L
Volume of NaOH= 44.45 mL = 0.04445 L
Concentration of NaOH= 0.1489 M
Now
The balanced equation is
H2SO4 + 2NaOH → Na2SO4 + 2H2O
Now the concentration of the H2SO4 solution is
b*Ca*Va = a*Cb*Vb
here, b = the coefficient of NaOH = 2
Ca = ?
Va = the volume of H2SO4= 30.0 mL = 0.030 L
a = the coefficient of H2SO4 = 1
Cb = the concentration of NaOH = 0.1489 M
Vb = the volume of NaOH = 44.45 mL = 0.04445 L
Now
2*Ca*0.030 = 1* 0.1489* 0.04445
0.060 * Ca = 0.00661
Ca = 0.1101 M
Hence, The concentration of the H2SO4 solution is 0.1101 M.
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what is the voilume of a solution that would result by diluting 50.0 mlof 0.101 m naoh to a ocfncentration of 0.0505m
The volume of the solution that would result by diluting 0.1M solution to 0.05M is 100ml.
The molarity of the substance is defined as the number of moles of solute per unit volume of solution in liters.
Hence, if we can write,
Molarity = moles/volume
Moles = molarity x volume
Moles are always constant, so,
initial molarity x initial volume = final molarity x final volume
The initial volume is 50ml and initial molarity is 0.1M, after diluting, the final molarity is 0.05M.
Putting values,
50 x 0.1 = Volume of NaOH after dilution x 0.05
Volume of NaOH after dilution = 100 ml.
So, the volume of the resulting solution after dilution is 100ml.
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A scientist has 4 pieces of copper. Each piece is a different shape and size (samples A 1 p through D). The student measures the volume and the mass of one sample, but measures only the volume or only the mass of the other samples. Since the scientist knows that copper is a substance, the scientist claims that she can predict what the mass will be of sample B and C. She also claims she can predict what the volume will be of sample D. Use the table below to calculate the MASS OF SAMPLE. Type ONLY THE NUMBER in the space below.
The value of the mass (B) will be equal to 9 grams and volume (D) will be equal to 5 cm^{3}.
What is density ?
Density is the degree of ways much “stuff” is in a given quantity of space. For example, a block of the heavier detail lead could be denser than the softer, lighter detail gold (Au). A block of Styrofoam is much less dense than a brick. It is described as mass in line with unit volume.
You can consider it, as how tightly or loosely packed a substance is, or how compact it is. Solids are commonly denser than beverages, and beverages denser than gases, however there are numerous exceptions.
Density is a bodily assets of matter, as every detail and compound has a completely unique density related to it. Density described in a qualitative way because the degree of the relative "heaviness" of gadgets with a regular volume.
Copper's Density is nearly equal to 9 and density is equal to mass/volume.
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Rationalize the order of elution of the two compounds you isolated from the column in this experiment.
Hexane is initially employed as the eluting solvent to remove the bibenzyl. The bibenzyl will be eluted first because the nonpolar molecule is particularly soluble in hexane (a nonpolar solvent) .
What is called a compound?A mixture in chemistry is a material comprised of two or more separate chemical elements mixed together in a certain proportion. Chemical connections that are challenging to break are created when the components interact with one another. These bonds result in the development of atoms sharing or trading electrons.
Is an element a compound?Pure components and compounds can be found in nature. A element is formed up of many elements in a predetermined ratio, as opposed to an element, which is a substance comprised of the same sort of atoms.
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if you overshoot the endpoint of a titration in this experiment, it means you added too much of the titrant (naoh). if this happens without realizing it, and you measure the volume of naoh you added, what will happen to the value you calculate for the concentration of naoh?
The value calculated by using excess if NaOH by overshooting endpoint during titration will be not correct.
The value of concentration is supposed to change when excess of NaOH is used. it will be little too high than the correct value. Thus, titration require precise values. Overshooting the endpoint will result in a calculation error for the solution that is being titrated. The calculation for the titrated solution will be off if the moles of titrant are incorrect because the volume of titrant is incorrect because it is higher than it should be.
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a sample of ethanol, c2h6o, has a mass of 72.75 g. calculate the number of ethanol molecules in the sample
The number of ethanol molecules in the sample are
The molecular mass of ethanol is 45.07 g/mol
Now to calculate the number of molecules of ethanol:
72.75 × (1 mol/46.07)
1.5 moles
Now multiply it with by Avogadro's number which is 6.02 X 10^23 molecules / mole.
1.5 × 6.02 X 10^23
9.03 X 10^23 molecules.
Hence the number of ethanol molecules in the sample 9.03 X 10^23 molecules.
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a balloon is partially inflated with 5.00 l of helium at sea level where the atmospheric pressure is 1.00 atm. the balloon ascends to an altitude of 1600 m where the pressure is 0.83 atm. a) what is the volume of the balloon at the higher altitude if the temperature of the helium does not change during the ascent? b) what is the percent increase in volume?
[tex]P 1 V 1 = P 2 V 2[/tex] ..we get [tex]V 2 = 6 . L[/tex] Explanation: [tex]V 2 = P 1 V 1 /P 2[/tex] = [tex]992 X 5.15 /857[/tex] mbar
what is volume and pressure?
Decreasing the volume of a contained gas will increase its pressure, and increasing its volume will decrease its pressure. In fact, if the volume increases by a certain factor, the pressure decreases by the same factor, and vice versa.The relation between volume V pressure P and absolute temperature T of an ideal gas is PV = xT where x is a constant.Boyle found that when the pressure of gas at a constant temperature is increased, the volume of the gas decreases. when the pressure of gas is decreased, the volume increases. this relationship between pressure and volume is called Boyle's law.The equations describing these laws are special cases of the ideal gas law, PV = nRT, where P is the pressure of the gas, V is its volume, n is the number of moles of the gas, T is its kelvin temperature, and R is the ideal (universal) gas constant.Boyle's law is a gas law that states that a gas's pressure and volume are inversely proportional. When the temperature is kept constant, as volume increases, pressure falls and vice versa.The reduction in the volume of the gas means that the molecules are striking the walls more often increasing the pressure, and conversely if the volume increases the distance the molecules must travel to strike the walls increases and they hit the walls less often thus decreasing the pressure.The principal effect of high pressure, observed in all materials, is a reduction in volume and a corresponding shortening of mean interatomic distances.to know more about volume and pressure follow
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how many grams of koh is required to produce 800 ml of 0.500 m naoh solution? enter the number only, not units
For every 800 ml of 0.500 m potassium oxide solution, one gramme of potassium hydroxide is needed.
The following knowledge is necessary to answer the question:
KOH has a molar mass of 56u.
Molarity is defined as Mass of Solute multiplied by 1000 or (Molar mass of Solute divided by mL of Solution).
Given are the values M=0.4 and V=800mL.
The formula yields the following result: 0.5 = Mass of KOH 1000/(56 800).
When it is solved, 8 grammes of KOH are required.
Molar mass simple: What is it?The molar mass of a substance is the weight of one mole of that substance, how many grammes are contained in one mole of a specific chemical is what is meant by the term "molar mass." The atomic masses used to calculate the molar mass are given in the periodic table.
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