Question 1

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 D

Question 2

A 1.000 kg sample of nitroglycerine,C3H5N3O9,explodes and releases gases with a temperature of 1985°C at 1.100 atm.What is the volume of gas produced?
4 C3H5N3O9(s)→ 12 CO2(g)+ 10 H2O(g)+ 6 N2(g)+ O2(g)

Accepted Answer

A)  742.2 L 
B)  3525 L 
C)  4730 L 
D)  5378 L 
A)  742.2 L 
B)  3525 L 
C)  4730 L 
D)  5378 L D

Question 3

A gas mixture contains CO,Ar and H2.What is the total pressure of the mixture,if the mole fraction of H2 is 0.350 and the pressure of H2 is 0.480 atm?

Accepted Answer

A)  1.37 atm 
B)  0.168 atm 
C)  5.95 atm 
D)  0.729 atm 
E)  2.1 atm 
A)  1.37 atm 
B)  0.168 atm 
C)  5.95 atm 
D)  0.729 atm 
E)  2.1 atm A

Question 4

Which of the following samples will have the lowest pressure if they are all at the same temperature and in identical containers (same volume)?

Accepted Answer

A)  15 g H2 
B)  15 g Ar 
C)  15 g Kr 
D)  15 g CO2 
E)  All of these samples will have the same pressure. 
A)  15 g H2 
B)  15 g Ar 
C)  15 g Kr 
D)  15 g CO2 
E)  All of these samples will have the same pressure.

Question 5

Which of the following would have a density of 1.37 g/L at 7.0°C and 0.987 atm?

Accepted Answer

A)  N2 
B)  O2 
C)  Kr  
D)  Rn  
A)  N2 
B)  O2 
C)  Kr  
D)  Rn

Question 6

How many moles of nitrogen will react with 380 mL of hydrogen at -30°C and 200 mm Hg?
N2(g)+ 3 H2(g)→ 2 NH3(g)

Accepted Answer

A)  0.0150 mol 
B)  0.00782 mol 
C)  0.00501 mol 
D)  0.00167 mol 
E)  0.0382 mol 
A)  0.0150 mol 
B)  0.00782 mol 
C)  0.00501 mol 
D)  0.00167 mol 
E)  0.0382 mol

Question 7

Zinc reacts with aqueous sulfuric acid to form hydrogen gas: Zn(s)+     (aq)→ Zn   (aq)+   (g)
In an experiment,201 mL of wet   is collected over water at 27°C and a barometric pressure of   The vapor pressure of water at 27°C is 26.74 torr.The partial pressure of hydrogen in this experiment is ________ atm.

Accepted Answer

A)  0.929 
B)  706 
C)  0.964 
D)  760 
E)  1.00 
A)  0.929 
B)  706 
C)  0.964 
D)  760 
E)  1.00

Question 8

Place the following gases in order of increasing density at STP. F2 NH3 N2O4 Ar

Accepted Answer

A)  N2O4 2 3 
B)  Ar 2O4 2 3 
C)  F2 2O4 3 
D)  NH3 2 2O4 
E)  Ar 2 3 2O4 
A)  N2O4 2 3 
B)  Ar 2O4 2 3 
C)  F2 2O4 3 
D)  NH3 2 2O4 
E)  Ar 2 3 2O4

Question 9

Which one of these will diffuse the fastest at 25°C?

Accepted Answer

A)  2.0 M Ar 
B)  1.0 M H2 
C)  2.0 M N2 
D)  0.5 M Ne 
E)  2.0 M O2 
A)  2.0 M Ar 
B)  1.0 M H2 
C)  2.0 M N2 
D)  0.5 M Ne 
E)  2.0 M O2

Question 10

A gas occupies 4.23 L at 2.25 atm.What is the volume at 3.46 atm?

Accepted Answer

A)  6.50 L 
B)  1.84 L 
C)  2.75 L 
D)  32.9 L 
E)  0.364 L 
A)  6.50 L 
B)  1.84 L 
C)  2.75 L 
D)  32.9 L 
E)  0.364 L

Question 11

A sample of 0.200 moles of nitrogen occupies 0.400 L.Under the same conditions,what number of moles occupies 1.200 L?

Accepted Answer

A)  0.600 moles 
B)  0.0667 moles 
C)  2.40 moles 
D)  0.0960 moles 
A)  0.600 moles 
B)  0.0667 moles 
C)  2.40 moles 
D)  0.0960 moles

Question 12

Calcium hydride (   )reacts with water to form hydrogen gas:   (s)+   O(l)→   (aq)+   (g) How many grams of   are needed to generate 48.0 L of   gas at a pressure of 0.888 atm and a temperature of 32°C?

Accepted Answer

A)  50.7 
B)  0.851 
C)  143 
D)  35.8 
E)  71.7 
A)  50.7 
B)  0.851 
C)  143 
D)  35.8 
E)  71.7

Question 13

What is the volume of 0.700 mol of neon gas at a pressure of 609.5 mm Hg and 117°C?

Accepted Answer

A)  0.0941 L 
B)  13.5 L 
C)  2.13 L 
D)  27.9 L 
E)  0.138 L 
A)  0.0941 L 
B)  13.5 L 
C)  2.13 L 
D)  27.9 L 
E)  0.138 L

Question 14

Give the gas that is the lowest percent by volume in dry gas.

Accepted Answer

A)  CO2 
B)  He 
C)  H2 
D)  N2 
A)  CO2 
B)  He 
C)  H2 
D)  N2

Question 15

Arrange the gases according to increasing rate of diffusion at 50°C.

Accepted Answer

A)  NO2 2 2 
B)  O2 2 2 
C)  O2 2 2 
D)  SO2 2 2 
E)  SO2 2 2 
A)  NO2 2 2 
B)  O2 2 2 
C)  O2 2 2 
D)  SO2 2 2 
E)  SO2 2 2

Question 16

What volume will a balloon occupy at 1.0 atm,if the balloon has a volume of 8.8 L at 4.4 atm?

Accepted Answer

A)  2.0 L 
B)  0.50 L 
C)  39 L 
D)  13 L 
E)  4.4 L 
A)  2.0 L 
B)  0.50 L 
C)  39 L 
D)  13 L 
E)  4.4 L

Question 17

Rank the following in order of decreasing rate of effusion. F2 SF6 He Ar

Accepted Answer

A)  SF6 > Ar > F2 > He 
B)  Ar > He > SF6 > F2 
C)  F2 > Ar > He > SF6 
D)  He > F2 > Ar > SF6 
E)  He > F2 > SF6 > Ar 
A)  SF6 > Ar > F2 > He 
B)  Ar > He > SF6 > F2 
C)  F2 > Ar > He > SF6 
D)  He > F2 > Ar > SF6 
E)  He > F2 > SF6 > Ar

Question 18

A 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.22 atm.What is the molar mass of the unknown compound?

Accepted Answer

A)  26.3 g/mol 
B)  33.9 g/mol 
C)  12.2 g/mol 
D)  38.0 g/mol 
E)  81.8 g/mol 
A)  26.3 g/mol 
B)  33.9 g/mol 
C)  12.2 g/mol 
D)  38.0 g/mol 
E)  81.8 g/mol

Question 19

A 55.0-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)  3.17 g 
B)  8.20 g 
C)  82.9 g 
D)  1210 g 
A)  3.17 g 
B)  8.20 g 
C)  82.9 g 
D)  1210 g

Question 20

What pressure will 2.6 × 1023 molecules of N2 exert in a 3.9 L container at 45°C?

Accepted Answer

A)  5.7 atm 
B)  1.7 atm 
C)  2.9 atm 
D)  3.4 atm 
E)  4.6 atm 
A)  5.7 atm 
B)  1.7 atm 
C)  2.9 atm 
D)  3.4 atm 
E)  4.6 atm

Exam 11: Gases

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

A 1.000 kg sample of nitroglycerine,C3H5N3O9,explodes and releases gases with a temperature of 1985°C at 1.100 atm.What is the volume of gas produced? 4 C3H5N3O9(s)→ 12 CO2(g)+ 10 H2O(g)+ 6 N2(g)+ O2(g)

A gas mixture contains CO,Ar and H2.What is the total pressure of the mixture,if the mole fraction of H2 is 0.350 and the pressure of H2 is 0.480 atm?

Which of the following samples will have the lowest pressure if they are all at the same temperature and in identical containers (same volume)?

Which of the following would have a density of 1.37 g/L at 7.0°C and 0.987 atm?

How many moles of nitrogen will react with 380 mL of hydrogen at -30°C and 200 mm Hg? N2(g)+ 3 H2(g)→ 2 NH3(g)

Place the following gases in order of increasing density at STP. F2 NH3 N2O4 Ar

Which one of these will diffuse the fastest at 25°C?

A gas occupies 4.23 L at 2.25 atm.What is the volume at 3.46 atm?

A sample of 0.200 moles of nitrogen occupies 0.400 L.Under the same conditions,what number of moles occupies 1.200 L?

Calcium hydride ( )reacts with water to form hydrogen gas: (s)+ O(l)→ (aq)+ (g) How many grams of are needed to generate 48.0 L of gas at a pressure of 0.888 atm and a temperature of 32°C?

What is the volume of 0.700 mol of neon gas at a pressure of 609.5 mm Hg and 117°C?

Give the gas that is the lowest percent by volume in dry gas.

Arrange the gases according to increasing rate of diffusion at 50°C.

What volume will a balloon occupy at 1.0 atm,if the balloon has a volume of 8.8 L at 4.4 atm?

Rank the following in order of decreasing rate of effusion. F2 SF6 He Ar

A 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.22 atm.What is the molar mass of the unknown compound?

A 55.0-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?

What pressure will 2.6 × 1023 molecules of N2 exert in a 3.9 L container at 45°C?

Essentials: Units, Measurements, and Problem Solving

Atoms

The Quantum Mechanical Model of the Atom

Periodic Properties of the Elements

Molecules and Compounds

Chemical Bonding I

Chemical Bonding Ii

Chemical Reactions and Chemical Quantities

Introduction to Solutions and Aqueous Reactions

Thermochemistry

Liquids, Solids, and Intermolecular Forces

Crystalline Solids and Modern Materials

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry

Transition Metals and Coordination Compounds

Filters

A 1.000 kg sample of nitroglycerine,C₃H₅N₃O₉,explodes and releases gases with a temperature of 1985°C at 1.100 atm.What is the volume of gas produced? 4 C₃H₅N₃O₉(s)→ 12 CO₂(g)+ 10 H₂O(g)+ 6 N₂(g)+ O₂(g)

A gas mixture contains CO,Ar and H₂.What is the total pressure of the mixture,if the mole fraction of H₂ is 0.350 and the pressure of H₂ is 0.480 atm?

How many moles of nitrogen will react with 380 mL of hydrogen at -30°C and 200 mm Hg? N₂(g)+ 3 H₂(g)→ 2 NH₃(g)

Place the following gases in order of increasing density at STP. F₂ NH₃ N₂O₄ Ar

Rank the following in order of decreasing rate of effusion. F₂ SF₆ He Ar

A 55.0-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?

What pressure will 2.6 × 10²³ molecules of N₂exert in a 3.9 L container at 45°C?