Question 1

Calculate the temperature if 0.0139 moles of Ne has a pressure of 1.237 bar in a 250 mL container.

Accepted Answer

A) 260 °C 
B) 61.8 °C 
C) -23.8 °C 
D) 15.4 °C 
E) -5.57 °C 
A) 260 °C 
B) 61.8 °C 
C) -23.8 °C 
D) 15.4 °C 
E) -5.57 °C

Question 2

Which statement is TRUE about kinetic molecular theory?

Accepted Answer

A) A single particle does not move in a straight line. 
B) The size of the particle is large compared to the volume. 
C) The collisions of particles with one another are completely elastic. 
D) The average kinetic energy of a particle is not proportional to the temperature. 
A) A single particle does not move in a straight line. 
B) The size of the particle is large compared to the volume. 
C) The collisions of particles with one another are completely elastic. 
D) The average kinetic energy of a particle is not proportional to the temperature.

Question 3

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 4

What pressure will 2.6 × 1023 molecules of H2 exert in a 3.9 L container at 45 °C?

Accepted Answer

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

Question 5

What is the volume of 5.60 g of O2 at 7.78 bar and 415 K?

Accepted Answer

A) 1.53 L 
B) 565 L 
C) 24.5 L 
D) 25.0 L 
E) 0.776 L 
A) 1.53 L 
B) 565 L 
C) 24.5 L 
D) 25.0 L 
E) 0.776 L

Question 6

A 45.0 L steel tank at 20.0 °C contains acetylene gas,C2H2,at a pressure of 1.41 bar.Assuming ideal behaviour,how many grams of acetylene are in the tank?

Accepted Answer

A) 2.60 g 
B) 10.0 g 
C) 67.8 g 
D) 990 g 
A) 2.60 g 
B) 10.0 g 
C) 67.8 g 
D) 990 g

Question 7

Which of the following gas samples would be most likely to behave ideally under the stated conditions?

Accepted Answer

A) Ne at STP 
B) CO at 200 bar and 25 °C 
C) SO2 at 2 bar and 0 K 
D) N2 at 1 bar and -70 °C 
E) O2 at 400 bar and 25 °C 
A) Ne at STP 
B) CO at 200 bar and 25 °C 
C) SO2 at 2 bar and 0 K 
D) N2 at 1 bar and -70 °C 
E) O2 at 400 bar and 25 °C

Question 8

Calculate the mass of nitrogen dioxide,NO2 ,required if a 5.00 L container is to be filled to 0.6478 bar at a temperature of 1.00 °C.

Accepted Answer

A) 5.40 g 
B) 8.14 g 
C) 3.97 g 
D) 5.09 g 
E) 6.56 g 
A) 5.40 g 
B) 8.14 g 
C) 3.97 g 
D) 5.09 g 
E) 6.56 g

Question 9

An unknown ideal gas was added to an evacuated 775 mL container at a temperature of 267.2 K.If 0.381 moles were added,what is the final pressure?

Accepted Answer

A) 15.8 bar 
B) 12.4 bar 
C) 9.92 bar 
D) 10.9 bar 
E) 8.92 bar 
A) 15.8 bar 
B) 12.4 bar 
C) 9.92 bar 
D) 10.9 bar 
E) 8.92 bar

Question 10

How many millilitres of ozone gas at 25.0 °C and 1.00 bar are needed to react with 45.00 mL of a 0.100 mol L-1 aqueous solution of KI according to the chemical equation shown below?
O3(g)+ 2I-(aq)+ H2O(l)→ O2(g)+ I2(s)+ 2OH-(aq)

Accepted Answer

A) 54.8 mL 
B) 110 mL 
C) 165 mL 
D) 220 mL 
A) 54.8 mL 
B) 110 mL 
C) 165 mL 
D) 220 mL

Question 11

Determine the volume of O2 (at STP)formed when 50.0 g of KClO3 decomposes according to the following reaction.The molar mass for KClO3 is 122.55 g mol-1. 2KClO3(s)→ 2KCl(s)+ 3O2(g)

Accepted Answer

A) 9.14 L 
B) 8.22 L 
C) 12.3 L 
D) 13.9 L 
E) 14.6 L 
A) 9.14 L 
B) 8.22 L 
C) 12.3 L 
D) 13.9 L 
E) 14.6 L

Question 12

A gas bottle contains 0.350 mol of gas at 0.973 bar pressure.If the final pressure is 1.165 bar,how many moles of gas were added to the bottle?

Accepted Answer

A) 0.0366 mol 
B) 0.0691 mol 
C) 0.387 mol 
D) 0.419 mol 
A) 0.0366 mol 
B) 0.0691 mol 
C) 0.387 mol 
D) 0.419 mol

Question 13

If a sample of 0.29 moles of Ar occupies 3.8 L under certain conditions,what volume will 0.66 moles occupy under the same conditions?

Accepted Answer

A) 12 L 
B) 8.6 L 
C) 17 L 
D) 5.0 L 
E) 15 L 
A) 12 L 
B) 8.6 L 
C) 17 L 
D) 5.0 L 
E) 15 L

Question 14

How many grams of zinc metal are required to produce 2.00 L of hydrogen gas at STP according to the chemical equation shown below? Zn(s)+ 2HCl(aq)→ ZnCl2(aq)+ H2(g)

Accepted Answer

A) 0.171 g 
B) 5.76 g 
C) 11.7 g 
D) 131 g 
A) 0.171 g 
B) 5.76 g 
C) 11.7 g 
D) 131 g

Question 15

A mixture of 1.0 mol He and 1.0 mol Ne are at STP in a rigid container.Which of the following statements is TRUE?

Accepted Answer

A) Both gases have the same average kinetic energy. 
B) Both gases contribute equally to the density of the mixture under these conditions. 
C) Both gases have the same molecular speed. 
D) The mixture has a volume of 22.4 L. 
E) All of the above are true. 
A) Both gases have the same average kinetic energy. 
B) Both gases contribute equally to the density of the mixture under these conditions. 
C) Both gases have the same molecular speed. 
D) The mixture has a volume of 22.4 L. 
E) All of the above are true.

Question 16

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 17

The mole fraction of argon in dry air near sea level is 1.818 × 105 ,where the molar mass of argon is 39.948.The concentration of argon in the atmosphere is ________ ppm.

Accepted Answer

A) 9.3 × 10-9 
B) 0.93   
C) 9.3 × 106 
D) 1.1 × 108 
E) 18.18 
A) 9.3 × 10-9 
B) 0.93   
C) 9.3 × 106 
D) 1.1 × 108 
E) 18.18

Question 18

What volume will 0.780 moles of He occupy at STP?

Accepted Answer

A) 22.4 L 
B) 70.0 L 
C) 43.7 L 
D) 17.7 L 
E) 15.6 L 
A) 22.4 L 
B) 70.0 L 
C) 43.7 L 
D) 17.7 L 
E) 15.6 L

Question 19

What pressure (in bar)will 0.44 moles of CO2 exert in a 2.6 L container at 25 °C?

Accepted Answer

A) 0.35 bar 
B) 4.2 bar 
C) 4.7 bar 
D) 8.6 bar 
E) 3.6 bar 
A) 0.35 bar 
B) 4.2 bar 
C) 4.7 bar 
D) 8.6 bar 
E) 3.6 bar

Question 20

Convert 3.1473 atm to bar.

Accepted Answer

A) 4.976 bar 
B) 3.189 bar 
C) 2.577 bar 
D) 4.112 bar 
E) 3.875 bar 
A) 4.976 bar 
B) 3.189 bar 
C) 2.577 bar 
D) 4.112 bar 
E) 3.875 bar

Exam 5: Gases

Calculate the temperature if 0.0139 moles of Ne has a pressure of 1.237 bar in a 250 mL container.

Which statement is TRUE about kinetic molecular theory?

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

What pressure will 2.6 × 1023 molecules of H2 exert in a 3.9 L container at 45 °C?

What is the volume of 5.60 g of O2 at 7.78 bar and 415 K?

A 45.0 L steel tank at 20.0 °C contains acetylene gas,C2H2,at a pressure of 1.41 bar.Assuming ideal behaviour,how many grams of acetylene are in the tank?

Which of the following gas samples would be most likely to behave ideally under the stated conditions?

Calculate the mass of nitrogen dioxide,NO2 ,required if a 5.00 L container is to be filled to 0.6478 bar at a temperature of 1.00 °C.

An unknown ideal gas was added to an evacuated 775 mL container at a temperature of 267.2 K.If 0.381 moles were added,what is the final pressure?

How many millilitres of ozone gas at 25.0 °C and 1.00 bar are needed to react with 45.00 mL of a 0.100 mol L-1 aqueous solution of KI according to the chemical equation shown below? O3(g)+ 2I-(aq)+ H2O(l)→ O2(g)+ I2(s)+ 2OH-(aq)

Determine the volume of O2 (at STP)formed when 50.0 g of KClO3 decomposes according to the following reaction.The molar mass for KClO3 is 122.55 g mol-1. 2KClO3(s)→ 2KCl(s)+ 3O2(g)

A gas bottle contains 0.350 mol of gas at 0.973 bar pressure.If the final pressure is 1.165 bar,how many moles of gas were added to the bottle?

If a sample of 0.29 moles of Ar occupies 3.8 L under certain conditions,what volume will 0.66 moles occupy under the same conditions?

How many grams of zinc metal are required to produce 2.00 L of hydrogen gas at STP according to the chemical equation shown below? Zn(s)+ 2HCl(aq)→ ZnCl2(aq)+ H2(g)

A mixture of 1.0 mol He and 1.0 mol Ne are at STP in a rigid container.Which of the following statements is TRUE?

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

The mole fraction of argon in dry air near sea level is 1.818 × 105 ,where the molar mass of argon is 39.948.The concentration of argon in the atmosphere is ________ ppm.

What volume will 0.780 moles of He occupy at STP?

What pressure (in bar)will 0.44 moles of CO2 exert in a 2.6 L container at 25 °C?

Convert 3.1473 atm to bar.

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Filters

What pressure will 2.6 × 10²³ molecules of H₂ exert in a 3.9 L container at 45 °C?

What is the volume of 5.60 g of O₂ at 7.78 bar and 415 K?

A 45.0 L steel tank at 20.0 °C contains acetylene gas,C₂H₂,at a pressure of 1.41 bar.Assuming ideal behaviour,how many grams of acetylene are in the tank?

Calculate the mass of nitrogen dioxide,NO₂ ,required if a 5.00 L container is to be filled to 0.6478 bar at a temperature of 1.00 °C.

How many millilitres of ozone gas at 25.0 °C and 1.00 bar are needed to react with 45.00 mL of a 0.100 mol L^-1 aqueous solution of KI according to the chemical equation shown below? O₃(g)+ 2I^-(aq)+ H₂O(l)→ O₂(g)+ I₂(s)+ 2OH^-(aq)

Determine the volume of O₂ (at STP)formed when 50.0 g of KClO₃ decomposes according to the following reaction.The molar mass for KClO₃is 122.55 g mol^-1. 2KClO₃(s)→ 2KCl(s)+ 3O₂(g)

How many grams of zinc metal are required to produce 2.00 L of hydrogen gas at STP according to the chemical equation shown below? Zn(s)+ 2HCl(aq)→ ZnCl₂(aq)+ H₂(g)

The mole fraction of argon in dry air near sea level is 1.818 × 10⁵ ,where the molar mass of argon is 39.948.The concentration of argon in the atmosphere is ________ ppm.

What pressure (in bar)will 0.44 moles of CO₂ exert in a 2.6 L container at 25 °C?