Question 1

How many moles of CO are contained in a 5.00 L tank at 155 °C and 2.80 bar?

Accepted Answer

A) 0.393 moles 
B) 1.10 moles 
C) 2.51 moles 
D) 0.455 moles 
E) 0.289 moles 
A) 0.393 moles 
B) 1.10 moles 
C) 2.51 moles 
D) 0.455 moles 
E) 0.289 moles

Question 2

The volume of a gas is proportional to number of moles of a gas. What is this known as?

Accepted Answer

A) Avogadro's law 
B) Ideal gas law 
C) Charles's law 
D) Boyle's law 
E) Dalton's law 
A) Avogadro's law 
B) Ideal gas law 
C) Charles's law 
D) Boyle's law 
E) Dalton's law

Question 3

The atmospheric pressure is 715 mmHg. What is the pressure in bar?

Accepted Answer

A) 1.10 bar 
B) 0.940 bar 
C) 1.08 bar 
D) 0.9533 bar 
E) 0.9197 bar 
A) 1.10 bar 
B) 0.940 bar 
C) 1.08 bar 
D) 0.9533 bar 
E) 0.9197 bar

Question 4

The mole fraction of nitrous oxide in dry air near sea level is 1.818 × 10-5, where the molar mass of nitrous oxide is 44.013. The concentration of nitrous oxide in the atmosphere is ________ ppm.

Accepted Answer

A) 2.0 × 1012 
B) 5.0 × 10-5 
C) 500 
D) 18.18 
E) 5.0 × 10-13 
A) 2.0 × 1012 
B) 5.0 × 10-5 
C) 500 
D) 18.18 
E) 5.0 × 10-13

Question 5

Identify the gas particle that travels the fastest.

Accepted Answer

A) H2 
B) O2 
C) Ne 
D) N2 
E) CO 
A) H2 
B) O2 
C) Ne 
D) N2 
E) CO

Question 6

Which of the following samples has the greatest density at STP?

Accepted Answer

A) NO2 
B) Xe 
C) SO2 
D) SF6 
E) All of these samples have the same density at STP. 
A) NO2 
B) Xe 
C) SO2 
D) SF6 
E) All of these samples have the same density at STP.

Question 7

Determine the density of CO2 gas at STP.

Accepted Answer

A) 1.94 g L-1 
B) 1.80 g L-1 
C) 2.24 g L-1 
D) 4.46 g L-1 
E) 5.10 g L-1 
A) 1.94 g L-1 
B) 1.80 g L-1 
C) 2.24 g L-1 
D) 4.46 g L-1 
E) 5.10 g L-1

Question 8

Define effusion.

Accepted Answer

Effusion is the proc

Question 9

This equation is used to calculate the properties of a gas under nonideal conditions.

Accepted Answer

A) Charles's law 
B) Avogadro's law 
C) Boyle's law 
D) van der Waals equation 
E) Dalton's law 
A) Charles's law 
B) Avogadro's law 
C) Boyle's law 
D) van der Waals equation 
E) Dalton's law

Question 10

The ratio of the rate of effusion of oxygen to an unknown gas is 0.935. What is the other gas?

Accepted Answer

A) Ne 
B) Ar 
C) F2 
D) N2 
A) Ne 
B) Ar 
C) F2 
D) N2

Question 11

Match the following.

-Dalton's law

Accepted Answer

A) measures blood pressure 
B) measures pressure of a gas 
C) V1/n1 = V2/n2 
D) PV = nRT 
E) P1V1 = P2V2
F)measures atmospheric pressure
G)V1/T1 = V2/T2
H)PT = PA + PB + PC ... 
A) measures blood pressure 
B) measures pressure of a gas 
C) V1/n1 = V2/n2 
D) PV = nRT 
E) P1V1 = P2V2
F)measures atmospheric pressure
G)V1/T1 = V2/T2
H)PT = PA + PB + PC ...

Question 12

Which of the gases in the graph below has the largest molar mass?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) There is not enough information to determine the answer. 
A) A 
B) B 
C) C 
D) D 
E) There is not enough information to determine the answer.

Question 13

Which of the following gases has the highest root mean square velocity at constant temperature? NH3 CO2 NO2 F2 O3

Accepted Answer

A) NH3 
B) CO2 
C) NO2 
D) F2 
E) O3 
A) NH3 
B) CO2 
C) NO2 
D) F2 
E) O3

Question 14

What is the volume of 9.783 × 1023 atoms of He at 9.25 bar and 512 K?

Accepted Answer

A) 7.48 L 
B) 3.69 L 
C) 1.85 L 
D) 15.4 L 
E) 30.8 L 
A) 7.48 L 
B) 3.69 L 
C) 1.85 L 
D) 15.4 L 
E) 30.8 L

Question 15

If 0.3781 g of a gas with a molecular weight of 18.015 g mol-1 is in a ridged 5.00 L container at 384 K, calculate the final pressure. Assume ideal behaviour.

Accepted Answer

A) 0.682 bar 
B) 0.109 bar 
C) 0.0867 bar 
D) 0.134 bar 
E) 0.0963 bar 
A) 0.682 bar 
B) 0.109 bar 
C) 0.0867 bar 
D) 0.134 bar 
E) 0.0963 bar

Question 16

Which of the following gases has the lowest average speed at 25 °C?

Accepted Answer

A) C3H8 
B) Kr    
C) CH3NH2 
D) SO2 
A) C3H8 
B) Kr    
C) CH3NH2 
D) SO2

Question 17

What is the average speed (actually the root mean square speed)of a neon atom at 27 °C?

Accepted Answer

A) 5.78 m s-1 
B) 19.3 m s-1 
C) 183 m s-1 
D) 609 m s-1 
A) 5.78 m s-1 
B) 19.3 m s-1 
C) 183 m s-1 
D) 609 m s-1

Question 18

Calculate the root mean square velocity of nitrogen molecules at 25 °C.

Accepted Answer

A) 729 m s-1 
B) 515 m s-1 
C) 149 m s-1 
D) 297 m s-1 
A) 729 m s-1 
B) 515 m s-1 
C) 149 m s-1 
D) 297 m s-1

Question 19

At what temperature does argon have a root mean square velocity of 492 m s-1?

Accepted Answer

A) 321 K 
B) 291 K 
C) 340 K 
D) 388 K 
E) 409 K 
A) 321 K 
B) 291 K 
C) 340 K 
D) 388 K 
E) 409 K

Question 20

The action of some commercial drain cleaners is based on the following reaction: 2NaOH(s)+ 2Al(s)+ 6H2O(l)→ 2NaAl(OH)4(s)+ 3H2(g)
What is the volume of H2 gas formed at STP when 6.32 g of Al reacts with excess NaOH?

Accepted Answer

A) 3.50 L 
B) 5.25L 
C) 7.98 L 
D) 8.59L 
A) 3.50 L 
B) 5.25L 
C) 7.98 L 
D) 8.59L

Exam 5: Gases

How many moles of CO are contained in a 5.00 L tank at 155 °C and 2.80 bar?

The volume of a gas is proportional to number of moles of a gas. What is this known as?

The atmospheric pressure is 715 mmHg. What is the pressure in bar?

The mole fraction of nitrous oxide in dry air near sea level is 1.818 × 10-5, where the molar mass of nitrous oxide is 44.013. The concentration of nitrous oxide in the atmosphere is ________ ppm.

Identify the gas particle that travels the fastest.

Which of the following samples has the greatest density at STP?

Determine the density of CO2 gas at STP.

Define effusion.

This equation is used to calculate the properties of a gas under nonideal conditions.

The ratio of the rate of effusion of oxygen to an unknown gas is 0.935. What is the other gas?

Match the following. -Dalton's law

Which of the gases in the graph below has the largest molar mass?

Which of the following gases has the highest root mean square velocity at constant temperature? NH3 CO2 NO2 F2 O3

What is the volume of 9.783 × 1023 atoms of He at 9.25 bar and 512 K?

If 0.3781 g of a gas with a molecular weight of 18.015 g mol-1 is in a ridged 5.00 L container at 384 K, calculate the final pressure. Assume ideal behaviour.

Which of the following gases has the lowest average speed at 25 °C?

What is the average speed (actually the root mean square speed)of a neon atom at 27 °C?

Calculate the root mean square velocity of nitrogen molecules at 25 °C.

At what temperature does argon have a root mean square velocity of 492 m s-1?

The action of some commercial drain cleaners is based on the following reaction: 2NaOH(s)+ 2Al(s)+ 6H2O(l)→ 2NaAl(OH)4(s)+ 3H2(g) What is the volume of H2 gas formed at STP when 6.32 g of Al reacts with excess NaOH?

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Molecules, Compounds, and Nomenclature

Chemical Reactions and Stoichiometry

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 Molecular Orbital Theory

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallury

Transition Metals and Coordination Compounds

Filters

The mole fraction of nitrous oxide in dry air near sea level is 1.818 × 10^-5, where the molar mass of nitrous oxide is 44.013. The concentration of nitrous oxide in the atmosphere is ________ ppm.

Determine the density of CO₂ gas at STP.

Which of the following gases has the highest root mean square velocity at constant temperature? NH₃ CO₂ NO₂ F₂ O₃

What is the volume of 9.783 × 10²³ atoms of He at 9.25 bar and 512 K?

If 0.3781 g of a gas with a molecular weight of 18.015 g mol^-1 is in a ridged 5.00 L container at 384 K, calculate the final pressure. Assume ideal behaviour.

At what temperature does argon have a root mean square velocity of 492 m s^-1?

The action of some commercial drain cleaners is based on the following reaction: 2NaOH(s)+ 2Al(s)+ 6H₂O(l)→ 2NaAl(OH)₄(s)+ 3H₂(g) What is the volume of H₂ gas formed at STP when 6.32 g of Al reacts with excess NaOH?