Question 1

A plot of the Maxwell distribution against speed for different molecules shows that

Accepted Answer

A) heavy molecules have a higher average speed. 
B) light molecules have a very narrow range of speeds. 
C) heavy molecules have a wide range of speeds. 
D) light molecules have a lower average speed. 
E) heavy molecules travel with speeds close to their average values. 
A) heavy molecules have a higher average speed. 
B) light molecules have a very narrow range of speeds. 
C) heavy molecules have a wide range of speeds. 
D) light molecules have a lower average speed. 
E) heavy molecules travel with speeds close to their average values. E

Question 2

What is the density of chlorine gas at 850 Torr and -12S1U1P1$\circ$S1S1P0C?

Accepted Answer

A) 27.8 g.L-1  
B) 3.70 g.L-1  
C) 3.39 g.L-1  
D) 7.40 g.L-1  
E) 1.85 g.L-1  
A) 27.8 g.L-1  
B) 3.70 g.L-1  
C) 3.39 g.L-1  
D) 7.40 g.L-1  
E) 1.85 g.L-1  B

Question 3

A Group 17 or Group 18 gas has a density of 2.92 g.L-1 at 1.00 atm and 25S1U1P1$\circ$S1S1P0C.The gas is

Accepted Answer

A) helium 
B) neon 
C) fluorine 
D) argon 
E) chlorine 
A) helium 
B) neon 
C) fluorine 
D) argon 
E) chlorine E

Question 4

Consider the following reaction: 4KO2(s)+ 2CO2(g)$\rightarrow$2K2CO3(s)+ 3O2(g)
How many liters of oxygen are produced at STP if 10.5 moles of carbon dioxide are used at STP?

Accepted Answer

A) 15.8 
B) 0.703 
C) 706 
D) 353 
E) 235 
A) 15.8 
B) 0.703 
C) 706 
D) 353 
E) 235

Question 5

A mixture of oxygen and helium is 92.3% by mass oxygen.What is the partial pressure of oxygen if atmospheric pressure is 745 Torr?

Accepted Answer

A) 412 Torr 
B) 446 Torr 
C) 688 Torr 
D) 333 Torr 
E) 299 Torr 
A) 412 Torr 
B) 446 Torr 
C) 688 Torr 
D) 333 Torr 
E) 299 Torr

Question 6

Ammonium nitrate can decompose according to the following equation: NH4NO3(s)$\rightarrow$ N2O(g)+ 2H2O(g)
How many liters of gas are produced by decomposition of 160 g of ammonium nitrate at STP?

Accepted Answer

A) 44.8 
B) 6.00 
C) 22.4 
D) 134 
E) 67.2 
A) 44.8 
B) 6.00 
C) 22.4 
D) 134 
E) 67.2

Question 7

A sample of gas with a volume of 750 mL exerts a pressure of 98.0 kPa at 30S1U1P1$\circ$S1S1P0C.What pressure will the sample exert when it is compressed to 250 mL and cooled to -25S1U1P1$\circ$S1S1P0C?

Accepted Answer

A) 353 kPa 
B) 241 kPa 
C) 359 kPa 
D) 39.9 kPa 
E) 26.7 kPa 
A) 353 kPa 
B) 241 kPa 
C) 359 kPa 
D) 39.9 kPa 
E) 26.7 kPa

Question 8

Sulfur dioxide reacts with oxygen gas to produce sulfur trioxide.How many moles of oxygen gas will react with 15.0 L of sulfur dioxide if both gases are at 101.3 kPa and 125S1U1P1$\circ$S1S1P0C?

Accepted Answer

A) 0.230 
B) 0.115 
C) 0.731 
D) 0.919 
E) 0.459 
A) 0.230 
B) 0.115 
C) 0.731 
D) 0.919 
E) 0.459

Question 9

A sample of a gas weighing 15.1 g occupies 2.25 L at 1.75 atm and 20.0S1U1P1$\circ$S1S1P0C.If the empirical formula of the gas is NO2,what is the molecular formula?

Accepted Answer

A) N5O10  
B) N3O6  
C) NO2  
D) N4O8  
E) N2O4  
A) N5O10  
B) N3O6  
C) NO2  
D) N4O8  
E) N2O4

Question 10

Which gas is least dense at STP?

Accepted Answer

A) Argon 
B) Hydrogen cyanide 
C) Chlorine 
D) Helium 
E) Ammonia 
A) Argon 
B) Hydrogen cyanide 
C) Chlorine 
D) Helium 
E) Ammonia

Question 11

For which of the following gases would you expect Z,the compression factor,to be greater than one at low pressures?

Accepted Answer

A) hydrogen 
B) methane 
C) ethane 
D) All gases have Z less than 1 at low pressure. 
A) hydrogen 
B) methane 
C) ethane 
D) All gases have Z less than 1 at low pressure.

Question 12

Oxygen can be produced in the laboratory by the reaction: 2KClO3(s)$\rightarrow$2KCl(s)+ 3O2(g)
How many moles of potassium chlorate are needed to produce 257 mL of oxygen,collected over water at 14S1U1P1$\circ$S1S1P0C and 97.6 kPa? The vapor pressure of water at 14S1U1P1$\circ$S1S1P0C is
1.60 kPa.

Accepted Answer

A) 6.89 *10-3  
B) 7.00 *10-3  
C) 7.12 *10-3  
D) 2.06 *10-3  
E) 1.55 *10-3  
A) 6.89 *10-3  
B) 7.00 *10-3  
C) 7.12 *10-3  
D) 2.06 *10-3  
E) 1.55 *10-3

Question 13

The height of mercury in a barometer is 77.5 cm.What height would water reach in a water barometer? The density of mercury is 13.6 g.cm-3 and that of water 1.00 g.cm-3 .The temperature is constant.

Accepted Answer

A) 175 cm 
B) 55.9 cm 
C) 760 cm 
D) 5.70 cm 
E) 1.05 * 103 cm 
A) 175 cm 
B) 55.9 cm 
C) 760 cm 
D) 5.70 cm 
E) 1.05 * 103 cm

Question 14

The height of water in a water barometer is 883 cm at 20S1U1P1$\circ$S1S1P0C.The density of water at 20S1U1P1$\circ$S1S1P0C is 0.998 g.cm-3.What is the pressure?

Accepted Answer

A) 88.3 kPa 
B) 8.81 * 103 Pa 
C) 101 kPa 
D) 8.64 * 103 Pa 
E) 86.4 kPa 
A) 88.3 kPa 
B) 8.81 * 103 Pa 
C) 101 kPa 
D) 8.64 * 103 Pa 
E) 86.4 kPa

Question 15

What volume is occupied by 1,000.g of fluorine gas at 10.00°C at a pressure of 735 Torr?

Accepted Answer

A) 22.3 L 
B) 44.6 L 
C) 621 L 
D) 632 L 
E) 4,690 L 
A) 22.3 L 
B) 44.6 L 
C) 621 L 
D) 632 L 
E) 4,690 L

Question 16

What is the molar mass of a gas whose density is 3.55 g.L-1 at 110S1U1P1$\circ$S1S1P0C and a pressure of 736 Torr?

Accepted Answer

A) 15.4 g.mol-1  
B) 79.5 g.mol-1  
C) 115 g.mol-1  
D) 152 g.mol-1  
E) 33.1 g.mol-1  
A) 15.4 g.mol-1  
B) 79.5 g.mol-1  
C) 115 g.mol-1  
D) 152 g.mol-1  
E) 33.1 g.mol-1

Question 17

In a gas,temperature is proportional to the square root of the average speed of the molecules.True or false?

Accepted Answer

A) True 
 B)False

Question 18

Consider the following reaction: 2K2CO3(s) + 3O2(g) $\rightarrow$ 4KO2(s) + 2CO2(g)
How many moles of K2CO3 are needed to react with 35.0 L of oxygen at STP?

Accepted Answer

A) 22.4 
B) 0.52 
C) 1.04 
D) 2.34 
E) 33.6 
A) 22.4 
B) 0.52 
C) 1.04 
D) 2.34 
E) 33.6

Question 19

Which of the following gases would you predict to have the smallest value of the van der Waals coefficient b?

Accepted Answer

A) C2F2Cl4 
B) CO 
C) C2FCl5 
D) ClF3 
E) C2F6 
A) C2F2Cl4 
B) CO 
C) C2FCl5 
D) ClF3 
E) C2F6

Question 20

A sample of oxygen gas collected at 25°C and 745 Torr has a vapor pressure of less than
745 Torr.True or false?

Accepted Answer

A) True 
 B)False

A plot of the Maxwell distribution against speed for different molecules shows that

What is the density of chlorine gas at 850 Torr and -12^$\circ$C?

A Group 17 or Group 18 gas has a density of 2.92 g.L^-¹ at 1.00 atm and 25^$\circ$C.The gas is

Consider the following reaction: 4KO₂(s)+ 2CO₂(g) $\rightarrow$ 2K₂CO₃(s)+ 3O₂(g) How many liters of oxygen are produced at STP if 10.5 moles of carbon dioxide are used at STP?

A mixture of oxygen and helium is 92.3% by mass oxygen.What is the partial pressure of oxygen if atmospheric pressure is 745 Torr?

Ammonium nitrate can decompose according to the following equation: NH₄NO₃(s) $\rightarrow$ N₂O(g)+ 2H₂O(g) How many liters of gas are produced by decomposition of 160 g of ammonium nitrate at STP?

A sample of gas with a volume of 750 mL exerts a pressure of 98.0 kPa at 30^$\circ$C.What pressure will the sample exert when it is compressed to 250 mL and cooled to -25^$\circ$C?

Sulfur dioxide reacts with oxygen gas to produce sulfur trioxide.How many moles of oxygen gas will react with 15.0 L of sulfur dioxide if both gases are at 101.3 kPa and 125^$\circ$C?

A sample of a gas weighing 15.1 g occupies 2.25 L at 1.75 atm and 20.0^$\circ$C.If the empirical formula of the gas is NO₂,what is the molecular formula?

Which gas is least dense at STP?

For which of the following gases would you expect Z,the compression factor,to be greater than one at low pressures?

Oxygen can be produced in the laboratory by the reaction: 2KClO₃(s) $\rightarrow$ 2KCl(s)+ 3O₂(g) How many moles of potassium chlorate are needed to produce 257 mL of oxygen,collected over water at 14^$\circ$C and 97.6 kPa? The vapor pressure of water at 14^$\circ$C is 1.60 kPa.

The height of mercury in a barometer is 77.5 cm.What height would water reach in a water barometer? The density of mercury is 13.6 g.cm^-³ and that of water 1.00 g.cm^-³ .The temperature is constant.

The height of water in a water barometer is 883 cm at 20^$\circ$C.The density of water at 20^$\circ$C is 0.998 g.cm^-³.What is the pressure?

What volume is occupied by 1,000.g of fluorine gas at 10.00°C at a pressure of 735 Torr?

What is the molar mass of a gas whose density is 3.55 g.L^-¹ at 110^$\circ$C and a pressure of 736 Torr?

In a gas,temperature is proportional to the square root of the average speed of the molecules.True or false?

Consider the following reaction: 2K₂CO_3(s) + 3O_2(g) $\rightarrow$ 4KO_2(s) + 2CO_2(g) How many moles of K₂CO₃ are needed to react with 35.0 L of oxygen at STP?

Which of the following gases would you predict to have the smallest value of the van der Waals coefficient b?

A sample of oxygen gas collected at 25°C and 745 Torr has a vapor pressure of less than 745 Torr.True or false?

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Exam 5: The Properties of Gases

A plot of the Maxwell distribution against speed for different molecules shows that

What is the density of chlorine gas at 850 Torr and -12 ∘\circ∘ C?

A Group 17 or Group 18 gas has a density of 2.92 g.L-1 at 1.00 atm and 25 ∘\circ∘ C.The gas is

Consider the following reaction: 4KO2(s)+ 2CO2(g) →\rightarrow→ 2K2CO3(s)+ 3O2(g) How many liters of oxygen are produced at STP if 10.5 moles of carbon dioxide are used at STP?

A mixture of oxygen and helium is 92.3% by mass oxygen.What is the partial pressure of oxygen if atmospheric pressure is 745 Torr?

Ammonium nitrate can decompose according to the following equation: NH4NO3(s) →\rightarrow→ N2O(g)+ 2H2O(g) How many liters of gas are produced by decomposition of 160 g of ammonium nitrate at STP?

A sample of gas with a volume of 750 mL exerts a pressure of 98.0 kPa at 30 ∘\circ∘ C.What pressure will the sample exert when it is compressed to 250 mL and cooled to -25 ∘\circ∘ C?

Sulfur dioxide reacts with oxygen gas to produce sulfur trioxide.How many moles of oxygen gas will react with 15.0 L of sulfur dioxide if both gases are at 101.3 kPa and 125 ∘\circ∘ C?

A sample of a gas weighing 15.1 g occupies 2.25 L at 1.75 atm and 20.0 ∘\circ∘ C.If the empirical formula of the gas is NO2,what is the molecular formula?

Which gas is least dense at STP?

For which of the following gases would you expect Z,the compression factor,to be greater than one at low pressures?

Oxygen can be produced in the laboratory by the reaction: 2KClO3(s) →\rightarrow→ 2KCl(s)+ 3O2(g) How many moles of potassium chlorate are needed to produce 257 mL of oxygen,collected over water at 14 ∘\circ∘ C and 97.6 kPa? The vapor pressure of water at 14 ∘\circ∘ C is 1.60 kPa.

The height of mercury in a barometer is 77.5 cm.What height would water reach in a water barometer? The density of mercury is 13.6 g.cm-3 and that of water 1.00 g.cm-3 .The temperature is constant.

The height of water in a water barometer is 883 cm at 20 ∘\circ∘ C.The density of water at 20 ∘\circ∘ C is 0.998 g.cm-3.What is the pressure?

What volume is occupied by 1,000.g of fluorine gas at 10.00°C at a pressure of 735 Torr?

What is the molar mass of a gas whose density is 3.55 g.L-1 at 110 ∘\circ∘ C and a pressure of 736 Torr?

In a gas,temperature is proportional to the square root of the average speed of the molecules.True or false?

Consider the following reaction: 2K2CO3(s) + 3O2(g) →\rightarrow→ 4KO2(s) + 2CO2(g) How many moles of K2CO3 are needed to react with 35.0 L of oxygen at STP?

Which of the following gases would you predict to have the smallest value of the van der Waals coefficient b?

A sample of oxygen gas collected at 25°C and 745 Torr has a vapor pressure of less than 745 Torr.True or false?

The Quantum World

Quantum Mechanics in Action: Atoms

Chemical Bonds

Molecular Shape and Structure

Liquids and Solids

Inorganic Materials

Thermodynamics: The First Law

Thermodynamics: The Second and Third Laws

Physical Equilibria

Chemical Equilibria

Acids and Bases

Aqueous Equilibria

Electrochemistry

Chemical Kinetics

The Elements: the Main Group Elements

The Elements: The D Block

Nuclear Chemistry

Organic Chemistry I

Organic Chemistry II

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What is the density of chlorine gas at 850 Torr and -12^$\circ$C?

A Group 17 or Group 18 gas has a density of 2.92 g.L^-¹ at 1.00 atm and 25^$\circ$C.The gas is

Consider the following reaction: 4KO₂(s)+ 2CO₂(g) $\rightarrow$ 2K₂CO₃(s)+ 3O₂(g) How many liters of oxygen are produced at STP if 10.5 moles of carbon dioxide are used at STP?

Ammonium nitrate can decompose according to the following equation: NH₄NO₃(s) $\rightarrow$ N₂O(g)+ 2H₂O(g) How many liters of gas are produced by decomposition of 160 g of ammonium nitrate at STP?

A sample of gas with a volume of 750 mL exerts a pressure of 98.0 kPa at 30^$\circ$C.What pressure will the sample exert when it is compressed to 250 mL and cooled to -25^$\circ$C?

Sulfur dioxide reacts with oxygen gas to produce sulfur trioxide.How many moles of oxygen gas will react with 15.0 L of sulfur dioxide if both gases are at 101.3 kPa and 125^$\circ$C?

A sample of a gas weighing 15.1 g occupies 2.25 L at 1.75 atm and 20.0^$\circ$C.If the empirical formula of the gas is NO₂,what is the molecular formula?

Oxygen can be produced in the laboratory by the reaction: 2KClO₃(s) $\rightarrow$ 2KCl(s)+ 3O₂(g) How many moles of potassium chlorate are needed to produce 257 mL of oxygen,collected over water at 14^$\circ$C and 97.6 kPa? The vapor pressure of water at 14^$\circ$C is 1.60 kPa.

The height of mercury in a barometer is 77.5 cm.What height would water reach in a water barometer? The density of mercury is 13.6 g.cm^-³ and that of water 1.00 g.cm^-³ .The temperature is constant.

The height of water in a water barometer is 883 cm at 20^$\circ$C.The density of water at 20^$\circ$C is 0.998 g.cm^-³.What is the pressure?

What is the molar mass of a gas whose density is 3.55 g.L^-¹ at 110^$\circ$C and a pressure of 736 Torr?

Consider the following reaction: 2K₂CO_3(s) + 3O_2(g) $\rightarrow$ 4KO_2(s) + 2CO_2(g) How many moles of K₂CO₃ are needed to react with 35.0 L of oxygen at STP?