Question 1

An approximation of absolute zero was made from an extrapolation of

Accepted Answer

A) P vs.1/V. 
B) V vs.T. 
C) n vs.V. 
D) V vs.1/T. 
A) P vs.1/V. 
B) V vs.T. 
C) n vs.V. 
D) V vs.1/T.

Question 2

A balloon contains 0.76 mol N2,0.18 mol O2,0.031 mol He and 0.026 mol H2 at 739 mm Hg.What is the partial pressure of O2?

Accepted Answer

A) 19 mm Hg 
B) 23 mm Hg 
C) 130 mm Hg 
D) 560 mm Hg 
A) 19 mm Hg 
B) 23 mm Hg 
C) 130 mm Hg 
D) 560 mm Hg

Question 3

An unknown gas effuses 2.3 times faster than N2O4 at the same temperature.What is the identity of the unknown gas?

Accepted Answer

A) CN2 
B) NH3 
C) N2O 
D) O3 
A) CN2 
B) NH3 
C) N2O 
D) O3

Question 4

How many liters of oxygen are needed to exactly react with 27.8 g of methane at STP? CH4(g)+ 2 O2(g)→ CO2(g)+ 2 H2O(l)

Accepted Answer

A) 19.5 L 
B) 39.0 L 
C) 77.9 L 
D) 85.0 L 
A) 19.5 L 
B) 39.0 L 
C) 77.9 L 
D) 85.0 L

Question 5

The volume of 350.mL of gas at 25°C is decreased to 250.mL at constant pressure.What is the final temperature of the gas?

Accepted Answer

A) -60.1°C 
B) 213°C 
C) 17.8°C 
D) 144°C 
A) -60.1°C 
B) 213°C 
C) 17.8°C 
D) 144°C

Question 6

If 0.40 mol of NaN3 reacts completely in the reaction shown below,then ________ L of N2 will be produced at STP.
2 NaN3(s)→ 2 Na(s)+ 3 N2(g)

Accepted Answer

Question 7

The SI unit for pressure is the

Accepted Answer

A) atmosphere. 
B) MM Hg. 
C) newton. 
D) pascal. 
A) atmosphere. 
B) MM Hg. 
C) newton. 
D) pascal.

Question 8

Chloroform is a volatile liquid once commonly used in the laboratory but now being phased out due to its ozone depletion potential.If the pressure of gaseous chloroform in a flask is 195 mm Hg at 25°C and its density is 1.25 g/L,what is the molar mass of chloroform?

Accepted Answer

A) 10.0 g/mol 
B) 76.3 g/mol 
C) 119 g/mol 
D) None of these 
A) 10.0 g/mol 
B) 76.3 g/mol 
C) 119 g/mol 
D) None of these

Question 9

The secondary pollutants in photochemical smog are ________.

Accepted Answer

nitrogen d

Question 10

Suppose you needed to closely monitor small changes in pressure inside a container using an open end manometer.For the best accuracy,the substance in the manometer should

Accepted Answer

A) be a solid. 
B) be mercury. 
C) have a high density. 
D) have a low density. 
A) be a solid. 
B) be mercury. 
C) have a high density. 
D) have a low density.

Question 11

At an atmospheric pressure of 745 mm Hg,what is the pressure of He gas inside a cylinder that is attached to an open-end manometer in which the level of mercury in the open side of the manometer is 25 mm Hg higher than the side that is attached to the gas cylinder?

Accepted Answer

The answer of At an atmospheric pressure of 745 mm...

Question 12

An unknown gas effuses 1.73 times faster than krypton.What is the molar mass of the gas?

Accepted Answer

A) 28.0 g/mol 
B) 48.4 g/mol 
C) 110 g/mol 
D) 251 g/mol 
A) 28.0 g/mol 
B) 48.4 g/mol 
C) 110 g/mol 
D) 251 g/mol

Question 13

A process by which gas molecules escape through a tiny hole in a membrane into a vacuum without collisions is called

Accepted Answer

A) Boyle's law. 
B) diffusion. 
C) effusion. 
D) compressibility. 
A) Boyle's law. 
B) diffusion. 
C) effusion. 
D) compressibility.

Question 14

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl2,and cylinder C contains N2.According to the kinetic molecular theory,which gas has the highest collision frequency?

Accepted Answer

A) Ar 
B) Cl2 
C) N2 
D) All have identical collision frequencies 
A) Ar 
B) Cl2 
C) N2 
D) All have identical collision frequencies

Question 15

One mole of which gas has the greatest density at STP?

Accepted Answer

A) Kr 
B) CO2 
C) Ar 
D) All three gases have the same density. 
A) Kr 
B) CO2 
C) Ar 
D) All three gases have the same density.

Question 16

A 1.75-L container filled with CO2 gas at 25°C and 225 kPa pressure springs a leak.When the container is re-sealed,the pressure is 185 kPA and the temperature is 10°C.How many moles of gas were lost?

Accepted Answer

A) 0.0213 mol 
B) 0.463 mol 
C) 0.561 mol 
D) 2.16 mol 
A) 0.0213 mol 
B) 0.463 mol 
C) 0.561 mol 
D) 2.16 mol

Question 17

What is the density of chlorine gas at STP?

Accepted Answer

A) 0.316 g/L 
B) 1.58 g/L 
C) 2.90 g/L 
D) 3.16 g/L 
A) 0.316 g/L 
B) 1.58 g/L 
C) 2.90 g/L 
D) 3.16 g/L

Question 18

The partial pressures of CH4,N2,and O2 in a sample of gas were found to be 143 mmHg,469 mmHg,and 251 mmHg,respectively.Calculate the mole fraction of oxygen.

Accepted Answer

A) 0.410 
B) 0.291 
C) 2.44 
D) 22.4 
A) 0.410 
B) 0.291 
C) 2.44 
D) 22.4

Question 19

-What is the pressure (in mm Hg)of the gas inside the above apparatus if the outside pressure,Patm,is 736 mm Hg and the difference in mercury levels,Δh,is 18 mm Hg?

Accepted Answer

A) 18 mm Hg 
B) 718 mm Hg 
C) 736 mm Hg 
D) 754 mm Hg 
A) 18 mm Hg 
B) 718 mm Hg 
C) 736 mm Hg 
D) 754 mm Hg

Question 20

If mercury (density = 13.6 g/cm3)at a height of 745 mm Hg in a mercury barometer is replaced with water (density = 1.00 g/cm3),under the same conditions the height of water will be

Accepted Answer

A) 0.180 ft. 
B) 2.44 ft. 
C) 33.2 ft. 
D) 399 ft. 
A) 0.180 ft. 
B) 2.44 ft. 
C) 33.2 ft. 
D) 399 ft.

Exam 10: Gases: Their Properties and Behavior

An approximation of absolute zero was made from an extrapolation of

A balloon contains 0.76 mol N2,0.18 mol O2,0.031 mol He and 0.026 mol H2 at 739 mm Hg.What is the partial pressure of O2?

An unknown gas effuses 2.3 times faster than N2O4 at the same temperature.What is the identity of the unknown gas?

How many liters of oxygen are needed to exactly react with 27.8 g of methane at STP? CH4(g)+ 2 O2(g)→ CO2(g)+ 2 H2O(l)

The volume of 350.mL of gas at 25°C is decreased to 250.mL at constant pressure.What is the final temperature of the gas?

If 0.40 mol of NaN3 reacts completely in the reaction shown below,then ________ L of N2 will be produced at STP. 2 NaN3(s)→ 2 Na(s)+ 3 N2(g)

The SI unit for pressure is the

Chloroform is a volatile liquid once commonly used in the laboratory but now being phased out due to its ozone depletion potential.If the pressure of gaseous chloroform in a flask is 195 mm Hg at 25°C and its density is 1.25 g/L,what is the molar mass of chloroform?

The secondary pollutants in photochemical smog are ________.

Suppose you needed to closely monitor small changes in pressure inside a container using an open end manometer.For the best accuracy,the substance in the manometer should

At an atmospheric pressure of 745 mm Hg,what is the pressure of He gas inside a cylinder that is attached to an open-end manometer in which the level of mercury in the open side of the manometer is 25 mm Hg higher than the side that is attached to the gas cylinder?

An unknown gas effuses 1.73 times faster than krypton.What is the molar mass of the gas?

A process by which gas molecules escape through a tiny hole in a membrane into a vacuum without collisions is called

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl2,and cylinder C contains N2.According to the kinetic molecular theory,which gas has the highest collision frequency?

One mole of which gas has the greatest density at STP?

A 1.75-L container filled with CO2 gas at 25°C and 225 kPa pressure springs a leak.When the container is re-sealed,the pressure is 185 kPA and the temperature is 10°C.How many moles of gas were lost?

What is the density of chlorine gas at STP?

The partial pressures of CH4,N2,and O2 in a sample of gas were found to be 143 mmHg,469 mmHg,and 251 mmHg,respectively.Calculate the mole fraction of oxygen.

-What is the pressure (in mm Hg)of the gas inside the above apparatus if the outside pressure,Patm,is 736 mm Hg and the difference in mercury levels,Δh,is 18 mm Hg?

If mercury (density = 13.6 g/cm3)at a height of 745 mm Hg in a mercury barometer is replaced with water (density = 1.00 g/cm3),under the same conditions the height of water will be

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A balloon contains 0.76 mol N₂,0.18 mol O₂,0.031 mol He and 0.026 mol H₂ at 739 mm Hg.What is the partial pressure of O₂?

An unknown gas effuses 2.3 times faster than N₂O₄ at the same temperature.What is the identity of the unknown gas?

How many liters of oxygen are needed to exactly react with 27.8 g of methane at STP? CH₄(g)+ 2 O₂(g)→ CO₂(g)+ 2 H₂O(l)

If 0.40 mol of NaN₃reacts completely in the reaction shown below,then ________ L of N₂ will be produced at STP. 2 NaN₃(s)→ 2 Na(s)+ 3 N₂(g)

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest collision frequency?

A 1.75-L container filled with CO₂ gas at 25°C and 225 kPa pressure springs a leak.When the container is re-sealed,the pressure is 185 kPA and the temperature is 10°C.How many moles of gas were lost?

The partial pressures of CH₄,N₂,and O₂ in a sample of gas were found to be 143 mmHg,469 mmHg,and 251 mmHg,respectively.Calculate the mole fraction of oxygen.

-What is the pressure (in mm Hg)of the gas inside the above apparatus if the outside pressure,P_atm,is 736 mm Hg and the difference in mercury levels,Δh,is 18 mm Hg?

If mercury (density = 13.6 g/cm³)at a height of 745 mm Hg in a mercury barometer is replaced with water (density = 1.00 g/cm³),under the same conditions the height of water will be