Question 1

The density of krypton gas at 1.21 atm and 50.0°C is ________ g/L.

Accepted Answer

A) 0.0456 
B) 0.262 
C) 0.295 
D) 3.82 
E) 7.65 
A) 0.0456 
B) 0.262 
C) 0.295 
D) 3.82 
E) 7.65

Question 2

The concentration of carbon monoxide in a sample of air is 9.2 ppm.There are ________ molecules of CO in 1.00 L of this air at 755 torr and 23°C.

Accepted Answer

A) 3.8 × 10-7 
B) 2.2 × 1021 
C) 2.9 × 1018 
D) 1.7 × 1020 
E) 2.3 × 1017 
A) 3.8 × 10-7 
B) 2.2 × 1021 
C) 2.9 × 1018 
D) 1.7 × 1020 
E) 2.3 × 1017

Question 3

What volume will 4.91 × 1022 atoms of Ne occupy at STP?

Accepted Answer

A) 1.10 L 
B) 2.00 L 
C) 2.24 L 
D) 3.11 L 
E) 1.83 L 
A) 1.10 L 
B) 2.00 L 
C) 2.24 L 
D) 3.11 L 
E) 1.83 L

Question 4

Why does hot air rise?

Accepted Answer

As air is heated,it expands an

Question 5

To what temperature must a balloon,initially at 25∘C and 2.00 L,be heated in order to have a volume of 6.00 L?

Accepted Answer

A) 993 K 
B) 403 K 
C) 75 K 
D) 655 K 
E) 894 K 
A) 993 K 
B) 403 K 
C) 75 K 
D) 655 K 
E) 894 K

Question 6

How many molecules of XeF6 are formed from 12.9 L of F2 (at 298 K and 2.60 atm)according to the following reaction? Assume that there is excess Xe. Xe(g)+ 3 F2(g)→ XeF6(g)

Accepted Answer

A) 1.21 × 1023 molecules XeF6 
B) 8.25 × 1023 molecules XeF6 
C) 2.75 × 1023 molecules XeF6 
D) 7.29 × 1023 molecules XeF6 
E) 1.37 × 1023 molecules XeF6 
A) 1.21 × 1023 molecules XeF6 
B) 8.25 × 1023 molecules XeF6 
C) 2.75 × 1023 molecules XeF6 
D) 7.29 × 1023 molecules XeF6 
E) 1.37 × 1023 molecules XeF6

Question 7

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 8

Which of the following gases has the highest average speed at 400K?

Accepted Answer

A) N2 
B) O2   
C) F2 
D) Cl2 
A) N2 
B) O2   
C) F2 
D) Cl2

Question 9

A mixture of 0.220 moles CO,0.350 moles H2 and 0.640 moles He has a total pressure of 2.95 atm.What is the pressure of H2?

Accepted Answer

A) 1.17 atm 
B) 0.853 atm 
C) 1.03 atm 
D) 0.969 atm 
E) 0.649 atm 
A) 1.17 atm 
B) 0.853 atm 
C) 1.03 atm 
D) 0.969 atm 
E) 0.649 atm

Question 10

A syringe contains 0.65 moles of He gas that occupy 750.0 mL.What volume (in L)of gas will the syringe hold if 0.35 moles of Ne is added?

Accepted Answer

A) 0.87 L 
B) 4.9 L 
C) 1.2 L 
D) 2.1 L 
E) 1.9 L 
A) 0.87 L 
B) 4.9 L 
C) 1.2 L 
D) 2.1 L 
E) 1.9 L

Question 11

If the pressure in a gas container that is connected to an open-end U-tube manometer is 116 kPa and the pressure of the atmosphere at the open end of the tube is 752 mm Hg,the level of mercury in the tube will

Accepted Answer

A) be 118 mm higher in the arm open to the atmosphere. 
B) be 118 mm higher in the arm connected to the gas cylinder. 
C) be 870 mm higher in the arm open to the atmosphere. 
D) be 870 mm higher in the arm connected to the gas cylinder. 
A) be 118 mm higher in the arm open to the atmosphere. 
B) be 118 mm higher in the arm connected to the gas cylinder. 
C) be 870 mm higher in the arm open to the atmosphere. 
D) be 870 mm higher in the arm connected to the gas cylinder.

Question 12

A gas sample contains 0.33 atm of Ne,0.45 atm of Ar,and 0.32 atm of CO.What is the total pressure?

Accepted Answer

A) 1.1 atm 
B) 1.2 atm 
C) 1.0 atm 
D) 0.51 atm 
A) 1.1 atm 
B) 1.2 atm 
C) 1.0 atm 
D) 0.51 atm

Question 13

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

Question 14

What is the total volume of the mixture of hydrogen gas and oxygen gas can be obtained from the electrolysis of 110.0 grams of water at 25.0°C and 1.00 atm pressure according to the chemical equation shown below?
2 H2O(l)→ 2 H2(g)+ O2(g)

Accepted Answer

A) 74.7 L 
B) 149 L 
C) 224 L 
D) 447 L 
A) 74.7 L 
B) 149 L 
C) 224 L 
D) 447 L

Question 15

What is the temperature of NO2 gas if the average speed (actually the root-mean-square speed)of the molecules is 750 m/s?

Accepted Answer

A) 1.38 K 
B) 1.04 × 103 K 
C) 1.38 × 103 K 
D) 1.04 × 106 K 
A) 1.38 K 
B) 1.04 × 103 K 
C) 1.38 × 103 K 
D) 1.04 × 106 K

Question 16

A balloon contains 0.76 mol N2,0.18 mol O2,0.031 mol He and 0.026 mol H2 at 749 mm Hg.What is the partial pressure of O2?

Accepted Answer

A) 20 mm Hg 
B) 23 mm Hg 
C) 140 mm Hg 
D) 570 mm Hg 
A) 20 mm Hg 
B) 23 mm Hg 
C) 140 mm Hg 
D) 570 mm Hg

Question 17

A balloon filled with helium gas at 20°C occupies 4.91 L at 1.00 atm.The balloon is immersed in liquid nitrogen at -196°C,while the pressure is raised to 5.20 atm.What is the volume of the balloon in the liquid nitrogen?

Accepted Answer

A) 0.25 L 
B) 3.6 L 
C) 6.7 L 
D) 97 L 
A) 0.25 L 
B) 3.6 L 
C) 6.7 L 
D) 97 L

Question 18

A syringe initially holds a sample of gas with a volume of 285 mL at 355 K and 1.88 atm.To what temperature must the gas in the syringe be heated/cooled in order to have a volume of 435 mL at 2.50 atm?

Accepted Answer

A) 139 K 
B) 572 K 
C) 175 K 
D) 466 K 
E) 721 K 
A) 139 K 
B) 572 K 
C) 175 K 
D) 466 K 
E) 721 K

Question 19

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

Question 20

How many grams of KCl(s)are produced from the thermal decomposition of KClO3(s)which produces 50.0 mL of O2(g)at 25°C and 1.00 atm pressure according to the chemical equation shown below?
2 KClO3(s)→ 2 KCl(s)+ 3 O2(g)?

Accepted Answer

A) 0.102 g 
B) 0.152 g 
C) 0.167 g 
D) 0.304 g 
A) 0.102 g 
B) 0.152 g 
C) 0.167 g 
D) 0.304 g

The density of krypton gas at 1.21 atm and 50.0°C is ________ g/L.

The concentration of carbon monoxide in a sample of air is 9.2 ppm.There are ________ molecules of CO in 1.00 L of this air at 755 torr and 23°C.

What volume will 4.91 × 10²²atoms of Ne occupy at STP?

Why does hot air rise?

To what temperature must a balloon,initially at 25^∘C and 2.00 L,be heated in order to have a volume of 6.00 L?

How many molecules of XeF₆are formed from 12.9 L of F₂ (at 298 K and 2.60 atm)according to the following reaction? Assume that there is excess Xe. Xe(g)+ 3 F₂(g)→ XeF₆(g)

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

Which of the following gases has the highest average speed at 400K?

A mixture of 0.220 moles CO,0.350 moles H₂ and 0.640 moles He has a total pressure of 2.95 atm.What is the pressure of H₂?

A syringe contains 0.65 moles of He gas that occupy 750.0 mL.What volume (in L)of gas will the syringe hold if 0.35 moles of Ne is added?

If the pressure in a gas container that is connected to an open-end U-tube manometer is 116 kPa and the pressure of the atmosphere at the open end of the tube is 752 mm Hg,the level of mercury in the tube will

A gas sample contains 0.33 atm of Ne,0.45 atm of Ar,and 0.32 atm of CO.What is the total pressure?

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

What is the total volume of the mixture of hydrogen gas and oxygen gas can be obtained from the electrolysis of 110.0 grams of water at 25.0°C and 1.00 atm pressure according to the chemical equation shown below? 2 H₂O(l)→ 2 H₂(g)+ O₂(g)

What is the temperature of NO₂ gas if the average speed (actually the root-mean-square speed)of the molecules is 750 m/s?

A balloon contains 0.76 mol N₂,0.18 mol O₂,0.031 mol He and 0.026 mol H₂ at 749 mm Hg.What is the partial pressure of O₂?

A balloon filled with helium gas at 20°C occupies 4.91 L at 1.00 atm.The balloon is immersed in liquid nitrogen at -196°C,while the pressure is raised to 5.20 atm.What is the volume of the balloon in the liquid nitrogen?

A syringe initially holds a sample of gas with a volume of 285 mL at 355 K and 1.88 atm.To what temperature must the gas in the syringe be heated/cooled in order to have a volume of 435 mL at 2.50 atm?

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)

How many grams of KCl(s)are produced from the thermal decomposition of KClO₃(s)which produces 50.0 mL of O₂(g)at 25°C and 1.00 atm pressure according to the chemical equation shown below? 2 KClO₃(s)→ 2 KCl(s)+ 3 O₂(g)?

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

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Exam 5: Gases

The density of krypton gas at 1.21 atm and 50.0°C is ________ g/L.

The concentration of carbon monoxide in a sample of air is 9.2 ppm.There are ________ molecules of CO in 1.00 L of this air at 755 torr and 23°C.

What volume will 4.91 × 1022 atoms of Ne occupy at STP?

Why does hot air rise?

To what temperature must a balloon,initially at 25∘C and 2.00 L,be heated in order to have a volume of 6.00 L?

How many molecules of XeF6 are formed from 12.9 L of F2 (at 298 K and 2.60 atm)according to the following reaction? Assume that there is excess Xe. Xe(g)+ 3 F2(g)→ XeF6(g)

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

Which of the following gases has the highest average speed at 400K?

A mixture of 0.220 moles CO,0.350 moles H2 and 0.640 moles He has a total pressure of 2.95 atm.What is the pressure of H2?

A syringe contains 0.65 moles of He gas that occupy 750.0 mL.What volume (in L)of gas will the syringe hold if 0.35 moles of Ne is added?

If the pressure in a gas container that is connected to an open-end U-tube manometer is 116 kPa and the pressure of the atmosphere at the open end of the tube is 752 mm Hg,the level of mercury in the tube will

A gas sample contains 0.33 atm of Ne,0.45 atm of Ar,and 0.32 atm of CO.What is the total pressure?

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

What is the total volume of the mixture of hydrogen gas and oxygen gas can be obtained from the electrolysis of 110.0 grams of water at 25.0°C and 1.00 atm pressure according to the chemical equation shown below? 2 H2O(l)→ 2 H2(g)+ O2(g)

What is the temperature of NO2 gas if the average speed (actually the root-mean-square speed)of the molecules is 750 m/s?

A balloon contains 0.76 mol N2,0.18 mol O2,0.031 mol He and 0.026 mol H2 at 749 mm Hg.What is the partial pressure of O2?

A balloon filled with helium gas at 20°C occupies 4.91 L at 1.00 atm.The balloon is immersed in liquid nitrogen at -196°C,while the pressure is raised to 5.20 atm.What is the volume of the balloon in the liquid nitrogen?

A syringe initially holds a sample of gas with a volume of 285 mL at 355 K and 1.88 atm.To what temperature must the gas in the syringe be heated/cooled in order to have a volume of 435 mL at 2.50 atm?

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)

How many grams of KCl(s)are produced from the thermal decomposition of KClO3(s)which produces 50.0 mL of O2(g)at 25°C and 1.00 atm pressure according to the chemical equation shown below? 2 KClO3(s)→ 2 KCl(s)+ 3 O2(g)?

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

What volume will 4.91 × 10²²atoms of Ne occupy at STP?

To what temperature must a balloon,initially at 25^∘C and 2.00 L,be heated in order to have a volume of 6.00 L?

How many molecules of XeF₆are formed from 12.9 L of F₂ (at 298 K and 2.60 atm)according to the following reaction? Assume that there is excess Xe. Xe(g)+ 3 F₂(g)→ XeF₆(g)

A mixture of 0.220 moles CO,0.350 moles H₂ and 0.640 moles He has a total pressure of 2.95 atm.What is the pressure of H₂?

What is the total volume of the mixture of hydrogen gas and oxygen gas can be obtained from the electrolysis of 110.0 grams of water at 25.0°C and 1.00 atm pressure according to the chemical equation shown below? 2 H₂O(l)→ 2 H₂(g)+ O₂(g)

What is the temperature of NO₂ gas if the average speed (actually the root-mean-square speed)of the molecules is 750 m/s?

A balloon contains 0.76 mol N₂,0.18 mol O₂,0.031 mol He and 0.026 mol H₂ at 749 mm Hg.What is the partial pressure of O₂?

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)

How many grams of KCl(s)are produced from the thermal decomposition of KClO₃(s)which produces 50.0 mL of O₂(g)at 25°C and 1.00 atm pressure according to the chemical equation shown below? 2 KClO₃(s)→ 2 KCl(s)+ 3 O₂(g)?