Question 1

A sample of neon at 30.5°C exerts a pressure of 701 mm Hg? What is its density?

Accepted Answer

A)  0.747 g/mL 
B)  563 g/mL 
C)  7.42 g/mL 
D)  1.38 g/mL 
E)  0.482 g/mL 
A)  0.747 g/mL 
B)  563 g/mL 
C)  7.42 g/mL 
D)  1.38 g/mL 
E)  0.482 g/mL

Question 2

What is the temperature of 100.8 g of N2 that exerts a pressure of 23.8 atm in a 6.51 L container?

Accepted Answer

A)  524K 
B)  489K 
C)  778K 
D)  261K 
E)  340K 
A)  524K 
B)  489K 
C)  778K 
D)  261K 
E)  340K

Question 3

How many liters of O2 gas at 25°C and 1.00 atm pressure are needed to react with 60.25 grams of potassium hydride according to the chemical equation shown below?
2 KH(s)+ O2(g)→ H2O(l)+ K2O(s)

Accepted Answer

A)  9.19 L 
B)  18.4 L 
C)  36.8 L 
D)  73.5 L 
A)  9.19 L 
B)  18.4 L 
C)  36.8 L 
D)  73.5 L

Question 4

Convert 1.50 atm to torr.

Accepted Answer

A)  760 torr 
B)  875 torr 
C)  1140 torr 
D)  1000 torr 
E)  1520 torr 
A)  760 torr 
B)  875 torr 
C)  1140 torr 
D)  1000 torr 
E)  1520 torr

Question 5

All of the following statements concerning real cases is correct EXCEPT

Accepted Answer

A)  molecules of real gases are attracted to each other. 
B)  molecules of real gases occupy no volume. 
C)  the pressure of a real gas at low temperatures is lower than for ideal gases. 
D)  the pressure of a real gas is due to collisions with the container. 
E)  nonideal gas behavior is described by the Van der Waals Equation. 
A)  molecules of real gases are attracted to each other. 
B)  molecules of real gases occupy no volume. 
C)  the pressure of a real gas at low temperatures is lower than for ideal gases. 
D)  the pressure of a real gas is due to collisions with the container. 
E)  nonideal gas behavior is described by the Van der Waals Equation.

Question 6

The concentration of ozone in a sample of air that has a partial pressure of   of 0.33 torr and a total pressure of air of 735 torr is ________ ppm.

Accepted Answer

A)  4.5 ×   
B)  0.45 
C)  0.045 
D)  2.2 ×   
E)  2.2 
A)  4.5 ×   
B)  0.45 
C)  0.045 
D)  2.2 ×   
E)  2.2

Question 7

What volume will 0.780 moles of Xe occupy at STP?

Accepted Answer

A)  22.4 L 
B)  70.0 L 
C)  43.7 atm 
D)  17.5 L 
E)  15.6 L 
A)  22.4 L 
B)  70.0 L 
C)  43.7 atm 
D)  17.5 L 
E)  15.6 L

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

What is the total volume of hydrogen gas and oxygen gas that can be produced from the thermal decomposition of 0.0425 grams of H2O2 at 700°C and 755 mm Hg according to the chemical equation shown below?
H2O2(l)→ H2(g)+ O2(g)

Accepted Answer

A)  50.2 mL 
B)  100 mL 
C)  151 mL 
D)  201 mL 
A)  50.2 mL 
B)  100 mL 
C)  151 mL 
D)  201 mL

Question 10

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 11

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

Accepted Answer

A)  0.399 moles 
B)  1.10 moles 
C)  2.51 moles 
D)  0.455 moles 
E)  0.289 moles 
A)  0.399 moles 
B)  1.10 moles 
C)  2.51 moles 
D)  0.455 moles 
E)  0.289 moles

Question 12

How many grams of water are required to produce 5.50 L of hydrogen gas at 25.0°C and 755 mm Hg pressure according to the chemical equation shown below?
BaH2(s)+ 2 H2O(l)→ Ba(OH)2(aq)+ 2 H2(g)

Accepted Answer

A)  2.01 g 
B)  4.02 g 
C)  4.07 g 
D)  8.04 g 
A)  2.01 g 
B)  4.02 g 
C)  4.07 g 
D)  8.04 g

Question 13

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 14

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 
B)  19.3 m/s 
C)  183 m/s 
D)  609 m/s 
A)  5.78 m/s 
B)  19.3 m/s 
C)  183 m/s 
D)  609 m/s

Question 15

How many grams of XeF6 are required to react with 0.579 L of hydrogen gas at 6.46 atm and 45°C in the reaction shown below?
XeF6(s)+ 3 H2(g)→ Xe(g)+ 6 HF(g)

Accepted Answer

A)  9.58 g 
B)  11.7 g 
C)  35.2 g 
D)  106 g 
A)  9.58 g 
B)  11.7 g 
C)  35.2 g 
D)  106 g

Question 16

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 17

A container filled with gas is connected to an open-end manometer that is filled with mineral oil.The pressure in the gas container is 753 mm Hg and atmospheric pressure is 724 mm.How high will the level rise in the manometer if the densities of Hg and mineral oil are 13.6 g/mL and 0.822 g/mL respectively?

Accepted Answer

A)  1.75 mm 
B)  23.8 mm 
C)  29.0 mm 
D)  480 mm 
A)  1.75 mm 
B)  23.8 mm 
C)  29.0 mm 
D)  480 mm

Question 18

The mole fraction of oxygen in dry air near sea level is 0.20948.The concentration of oxygen is ________ molecules per liter,assuming an atmospheric pressure of 739 torr and a temperature of 29.5°C.

Accepted Answer

A)  6.23 
B)  0.00819 
C)  4.93 × 1021 
D)  3.75 × 1024 
E)  5.07 × 1022 
A)  6.23 
B)  0.00819 
C)  4.93 × 1021 
D)  3.75 × 1024 
E)  5.07 × 1022

Question 19

An instrument used to measure the pressure of a gas in a laboratory is called a

Accepted Answer

A)  barometer. 
B)  manometer. 
C)  sphygmomanometer. 
D)  spectrophotometer. 
E)  spectrometer. 
A)  barometer. 
B)  manometer. 
C)  sphygmomanometer. 
D)  spectrophotometer. 
E)  spectrometer.

Question 20

A gas is at 35.0°C and 3.50 L.What is the temperature at 7.00 L?

Accepted Answer

A)  343°C 
B)  70.0°C 
C)  616°C 
D)  1.16°C 
E)  17.5°C 
A)  343°C 
B)  70.0°C 
C)  616°C 
D)  1.16°C 
E)  17.5°C

Exam 11: Gases

A sample of neon at 30.5°C exerts a pressure of 701 mm Hg? What is its density?

What is the temperature of 100.8 g of N2 that exerts a pressure of 23.8 atm in a 6.51 L container?

How many liters of O2 gas at 25°C and 1.00 atm pressure are needed to react with 60.25 grams of potassium hydride according to the chemical equation shown below? 2 KH(s)+ O2(g)→ H2O(l)+ K2O(s)

Convert 1.50 atm to torr.

All of the following statements concerning real cases is correct EXCEPT

The concentration of ozone in a sample of air that has a partial pressure of of 0.33 torr and a total pressure of air of 735 torr is ________ ppm.

What volume will 0.780 moles of Xe occupy at STP?

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

What is the total volume of hydrogen gas and oxygen gas that can be produced from the thermal decomposition of 0.0425 grams of H2O2 at 700°C and 755 mm Hg according to the chemical equation shown below? H2O2(l)→ H2(g)+ O2(g)

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?

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

How many grams of water are required to produce 5.50 L of hydrogen gas at 25.0°C and 755 mm Hg pressure according to the chemical equation shown below? BaH2(s)+ 2 H2O(l)→ Ba(OH)2(aq)+ 2 H2(g)

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

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

How many grams of XeF6 are required to react with 0.579 L of hydrogen gas at 6.46 atm and 45°C in the reaction shown below? XeF6(s)+ 3 H2(g)→ Xe(g)+ 6 HF(g)

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 oxygen in dry air near sea level is 0.20948.The concentration of oxygen is ________ molecules per liter,assuming an atmospheric pressure of 739 torr and a temperature of 29.5°C.

An instrument used to measure the pressure of a gas in a laboratory is called a

A gas is at 35.0°C and 3.50 L.What is the temperature at 7.00 L?

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

What is the temperature of 100.8 g of N₂ that exerts a pressure of 23.8 atm in a 6.51 L container?

How many liters of O₂ gas at 25°C and 1.00 atm pressure are needed to react with 60.25 grams of potassium hydride according to the chemical equation shown below? 2 KH(s)+ O₂(g)→ H₂O(l)+ K₂O(s)

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

What is the total volume of hydrogen gas and oxygen gas that can be produced from the thermal decomposition of 0.0425 grams of H₂O₂ at 700°C and 755 mm Hg according to the chemical equation shown below? H₂O₂(l)→ H₂(g)+ O₂(g)

How many grams of water are required to produce 5.50 L of hydrogen gas at 25.0°C and 755 mm Hg pressure according to the chemical equation shown below? BaH₂(s)+ 2 H₂O(l)→ Ba(OH)₂(aq)+ 2 H₂(g)

How many grams of XeF₆ are required to react with 0.579 L of hydrogen gas at 6.46 atm and 45°C in the reaction shown below? XeF₆(s)+ 3 H₂(g)→ Xe(g)+ 6 HF(g)

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?