Question 1

What is the density of hydrogen gas at STP?

Accepted Answer

A) 11.1 g/L 
B) 0.0450 g/L 
C) 0.0823 g/L 
D) 0.0899 g/L 
A) 11.1 g/L 
B) 0.0450 g/L 
C) 0.0823 g/L 
D) 0.0899 g/L

Question 2

Determine the density of CO2 gas at STP.

Accepted Answer

A) 1.96 g/L 
B) 1.80 g/L 
C) 2.24 g/L 
D) 4.46 g/L 
E) 5.10 g/L 
A) 1.96 g/L 
B) 1.80 g/L 
C) 2.24 g/L 
D) 4.46 g/L 
E) 5.10 g/L

Question 3

What pressure (in atm)will a sample of O2 gas occupy at 100.0 mL,if O2 has a volume of 25.00 mL at 2.0 atm?

Accepted Answer

A) 4.0 atm 
B) 2.0 atm 
C) 125.atm 
D) 0.50 atm 
E) 8.00 atm 
A) 4.0 atm 
B) 2.0 atm 
C) 125.atm 
D) 0.50 atm 
E) 8.00 atm

Question 4

What mass of NO2 is contained in a 13.0 L tank at 4.58 atm and 385 K?

Accepted Answer

A) 18.8 g 
B) 53.1 g 
C) 24.4 g 
D) 86.7 g 
E) 69.2 g 
A) 18.8 g 
B) 53.1 g 
C) 24.4 g 
D) 86.7 g 
E) 69.2 g

Question 5

A gas bottle contains 0.250 mol of gas at 730 mm Hg pressure.If the final pressure is 1.15 atm,how many moles of gas were added to the bottle?

Accepted Answer

A) 0.0262 mol 
B) 0.0493 mol 
C) 0.276 mol 
D) 0.299 mol 
A) 0.0262 mol 
B) 0.0493 mol 
C) 0.276 mol 
D) 0.299 mol

Question 6

A 45.0-L steel tank at 20.0°C contains acetylene gas,C2H2,at a pressure of 1.39 atm.Assuming ideal behavior,how many grams of acetylene are in the tank?

Accepted Answer

A) 2.60 g 
B) 10.0 g 
C) 67.8 g 
D) 990 g 
A) 2.60 g 
B) 10.0 g 
C) 67.8 g 
D) 990 g

Question 7

Calculate the temperature,in K,of 2.20 moles of gas occupying 3.50 L at 3.30 atm.

Accepted Answer

A) 64.0 K 
B) 5.25 K 
C) 337 K 
D) 28.0 K 
A) 64.0 K 
B) 5.25 K 
C) 337 K 
D) 28.0 K

Question 8

Determine the density of NH3 gas at 435 K and 1.00 atm.

Accepted Answer

A) 2.10 g/L 
B) 0.477 g/L 
C) 0.321 g/L 
D) 2.24 g/L 
E) 0.851 g/L 
A) 2.10 g/L 
B) 0.477 g/L 
C) 0.321 g/L 
D) 2.24 g/L 
E) 0.851 g/L

Question 9

A gas mixture consists of N2,O2,and Ne,where the mole fraction of N2 is 0.55 and the mole fraction of Ne is 0.25.If the mixture is at STP in a 5.0 L container,how many molecules of O2 are present?

Accepted Answer

A) 4.5 × 1022 molecules O2 
B) 2.7 × 1022 molecules O2 
C) 3.7 × 1023 molecules O2 
D) 1.1 × 1023 molecules O2 
E) 9.3 × 1024 molecules O2 
A) 4.5 × 1022 molecules O2 
B) 2.7 × 1022 molecules O2 
C) 3.7 × 1023 molecules O2 
D) 1.1 × 1023 molecules O2 
E) 9.3 × 1024 molecules O2

Question 10

Match the following.
-Dalton's Law

Accepted Answer

A) PV = nRT 
B) V1/n1 = V2/n2 
C) PT = PA + PB + PC ... 
D) P1V1 = P2V2 
E) V1/T1 = V2/T2 
A) PV = nRT 
B) V1/n1 = V2/n2 
C) PT = PA + PB + PC ... 
D) P1V1 = P2V2 
E) V1/T1 = V2/T2

Question 11

The mole fraction of argon in dry air near sea level is 1.818 × 10-5 where the molar mass of argon is 39.948.The concentration of argon in the atmosphere is ________ ppm.

Accepted Answer

A) 1.07 × 108 
B) 0.934 
C) 9.34 × 106 
D) 18.18 
E) 9.34 × 10-9 
A) 1.07 × 108 
B) 0.934 
C) 9.34 × 106 
D) 18.18 
E) 9.34 × 10-9

Question 12

Which container has the lowest pressure? All containers have same volume and temperature.Assume that the mass does not affect pressure.
A B C

Accepted Answer

A) A 
B) B 
C) C 
D) A and B 
A) A 
B) B 
C) C 
D) A and B

Question 13

A gas mixture contains CO,Ar and H2.What is the total pressure of the mixture,if the mole fraction of H2 is 0.35 and the pressure of H2 is 0.58 atm?

Accepted Answer

A) 1.7 atm 
B) 0.20 atm 
C) 0.49 atm 
D) 0.60 atm 
E) 2.1 atm 
A) 1.7 atm 
B) 0.20 atm 
C) 0.49 atm 
D) 0.60 atm 
E) 2.1 atm

Question 14

How many liters of oxygen are needed to exactly react with 19.8 g of methane at STP?
CH4(g)+ 2 O2(g)→ CO2(g)+ 2 H2O(l)

Accepted Answer

A) 13.9 L 
B) 27.8 L 
C) 55.5 L 
D) 60.5 L 
A) 13.9 L 
B) 27.8 L 
C) 55.5 L 
D) 60.5 L

Question 15

How many liters of hydrogen gas are needed to produce 100.0 grams of water at 25.0°C and 1.00 atm pressure according to the chemical equation shown below?
2 H2(g)+ O2(g)→ 2 H2O(l)

Accepted Answer

A) 67.9 L 
B) 136 L 
C) 203 L 
D) 407 L 
A) 67.9 L 
B) 136 L 
C) 203 L 
D) 407 L

Question 16

Three identical flasks contain three different gases at standard temperature and pressure.Flask A contains C2H4,flask B contains O3,and flask C contains F2.Which flask contains the largest number of molecules?

Accepted Answer

A) flask A 
B) flask B 
C) flask C 
D) All contain same number of molecules. 
A) flask A 
B) flask B 
C) flask C 
D) All contain same number of molecules.

Question 17

The volume of 350.mL of gas at 25°C is decreased to 135 mL at constant pressure.What is the final temperature of the gas?

Accepted Answer

A) -158°C 
B) 9.6°C 
C) 65°C 
D) 500°C 
A) -158°C 
B) 9.6°C 
C) 65°C 
D) 500°C

Question 18

Which of the following samples will have the greatest volume at STP?

Accepted Answer

A) 22 g Ne 
B) 22 g He 
C) 22 g O2 
D) 22 g Cl2 
E) All of these samples would have the same volume at STP. 
A) 22 g Ne 
B) 22 g He 
C) 22 g O2 
D) 22 g Cl2 
E) All of these samples would have the same volume at STP.

Question 19

Which statement is true about kinetic molecular theory?

Accepted Answer

A) A single particle does not move in a straight line. 
B) The size of the particle is large compared to the volume. 
C) The collisions of particles with one another is completely elastic. 
D) The average kinetic energy of a particle is not proportional to the temperature. 
A) A single particle does not move in a straight line. 
B) The size of the particle is large compared to the volume. 
C) The collisions of particles with one another is completely elastic. 
D) The average kinetic energy of a particle is not proportional to the temperature.

Question 20

What is the major component in dry air?

Accepted Answer

The answer of What is the major component in dry...

What is the density of hydrogen gas at STP?

Determine the density of CO₂ gas at STP.

What pressure (in atm)will a sample of O₂ gas occupy at 100.0 mL,if O₂ has a volume of 25.00 mL at 2.0 atm?

What mass of NO₂ is contained in a 13.0 L tank at 4.58 atm and 385 K?

A gas bottle contains 0.250 mol of gas at 730 mm Hg pressure.If the final pressure is 1.15 atm,how many moles of gas were added to the bottle?

A 45.0-L steel tank at 20.0°C contains acetylene gas,C₂H₂,at a pressure of 1.39 atm.Assuming ideal behavior,how many grams of acetylene are in the tank?

Calculate the temperature,in K,of 2.20 moles of gas occupying 3.50 L at 3.30 atm.

Determine the density of NH₃ gas at 435 K and 1.00 atm.

A gas mixture consists of N₂,O₂,and Ne,where the mole fraction of N₂ is 0.55 and the mole fraction of Ne is 0.25.If the mixture is at STP in a 5.0 L container,how many molecules of O₂ are present?

Match the following. -Dalton's Law

The mole fraction of argon in dry air near sea level is 1.818 × 10^-5 where the molar mass of argon is 39.948.The concentration of argon in the atmosphere is ________ ppm.

Which container has the lowest pressure? All containers have same volume and temperature.Assume that the mass does not affect pressure. A B C

A gas mixture contains CO,Ar and H₂.What is the total pressure of the mixture,if the mole fraction of H₂ is 0.35 and the pressure of H₂ is 0.58 atm?

How many liters of oxygen are needed to exactly react with 19.8 g of methane at STP? CH₄(g)+ 2 O₂(g)→ CO₂(g)+ 2 H₂O(l)

How many liters of hydrogen gas are needed to produce 100.0 grams of water at 25.0°C and 1.00 atm pressure according to the chemical equation shown below? 2 H₂(g)+ O₂(g)→ 2 H₂O(l)

Three identical flasks contain three different gases at standard temperature and pressure.Flask A contains C₂H₄,flask B contains O₃,and flask C contains F₂.Which flask contains the largest number of molecules?

The volume of 350.mL of gas at 25°C is decreased to 135 mL at constant pressure.What is the final temperature of the gas?

Which of the following samples will have the greatest volume at STP?

Which statement is true about kinetic molecular theory?

What is the major component in dry air?

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Exam 5: Gases

What is the density of hydrogen gas at STP?

Determine the density of CO2 gas at STP.

What pressure (in atm)will a sample of O2 gas occupy at 100.0 mL,if O2 has a volume of 25.00 mL at 2.0 atm?

What mass of NO2 is contained in a 13.0 L tank at 4.58 atm and 385 K?

A gas bottle contains 0.250 mol of gas at 730 mm Hg pressure.If the final pressure is 1.15 atm,how many moles of gas were added to the bottle?

A 45.0-L steel tank at 20.0°C contains acetylene gas,C2H2,at a pressure of 1.39 atm.Assuming ideal behavior,how many grams of acetylene are in the tank?

Calculate the temperature,in K,of 2.20 moles of gas occupying 3.50 L at 3.30 atm.

Determine the density of NH3 gas at 435 K and 1.00 atm.

A gas mixture consists of N2,O2,and Ne,where the mole fraction of N2 is 0.55 and the mole fraction of Ne is 0.25.If the mixture is at STP in a 5.0 L container,how many molecules of O2 are present?

Match the following. -Dalton's Law

The mole fraction of argon in dry air near sea level is 1.818 × 10-5 where the molar mass of argon is 39.948.The concentration of argon in the atmosphere is ________ ppm.

Which container has the lowest pressure? All containers have same volume and temperature.Assume that the mass does not affect pressure. A B C

A gas mixture contains CO,Ar and H2.What is the total pressure of the mixture,if the mole fraction of H2 is 0.35 and the pressure of H2 is 0.58 atm?

How many liters of oxygen are needed to exactly react with 19.8 g of methane at STP? CH4(g)+ 2 O2(g)→ CO2(g)+ 2 H2O(l)

How many liters of hydrogen gas are needed to produce 100.0 grams of water at 25.0°C and 1.00 atm pressure according to the chemical equation shown below? 2 H2(g)+ O2(g)→ 2 H2O(l)

Three identical flasks contain three different gases at standard temperature and pressure.Flask A contains C2H4,flask B contains O3,and flask C contains F2.Which flask contains the largest number of molecules?

The volume of 350.mL of gas at 25°C is decreased to 135 mL at constant pressure.What is the final temperature of the gas?

Which of the following samples will have the greatest volume at STP?

Which statement is true about kinetic molecular theory?

What is the major component in dry air?

Matter, Measurement, and Problem Solving

Atoms and Elements

Molecules, Compounds and Chemical Equations

Chemical Quantities and Aqueous Reactions

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Filters

Determine the density of CO₂ gas at STP.

What pressure (in atm)will a sample of O₂ gas occupy at 100.0 mL,if O₂ has a volume of 25.00 mL at 2.0 atm?

What mass of NO₂ is contained in a 13.0 L tank at 4.58 atm and 385 K?

A 45.0-L steel tank at 20.0°C contains acetylene gas,C₂H₂,at a pressure of 1.39 atm.Assuming ideal behavior,how many grams of acetylene are in the tank?

Determine the density of NH₃ gas at 435 K and 1.00 atm.

A gas mixture consists of N₂,O₂,and Ne,where the mole fraction of N₂ is 0.55 and the mole fraction of Ne is 0.25.If the mixture is at STP in a 5.0 L container,how many molecules of O₂ are present?

The mole fraction of argon in dry air near sea level is 1.818 × 10^-5 where the molar mass of argon is 39.948.The concentration of argon in the atmosphere is ________ ppm.

A gas mixture contains CO,Ar and H₂.What is the total pressure of the mixture,if the mole fraction of H₂ is 0.35 and the pressure of H₂ is 0.58 atm?

How many liters of oxygen are needed to exactly react with 19.8 g of methane at STP? CH₄(g)+ 2 O₂(g)→ CO₂(g)+ 2 H₂O(l)

How many liters of hydrogen gas are needed to produce 100.0 grams of water at 25.0°C and 1.00 atm pressure according to the chemical equation shown below? 2 H₂(g)+ O₂(g)→ 2 H₂O(l)

Three identical flasks contain three different gases at standard temperature and pressure.Flask A contains C₂H₄,flask B contains O₃,and flask C contains F₂.Which flask contains the largest number of molecules?