Question 1

At 1000°C and 10.0 Torr, the density of a certain element in the gas phase is 2.9 x 10-3 g/L. What is the element?

Accepted Answer

A)  Ar 
B)  Ne 
C)  Br 
D)  Cl 
E)  Na 
A)  Ar 
B)  Ne 
C)  Br 
D)  Cl 
E)  Na

Question 2

The level of mercury on the sample side of a manometer is 156 mm below that of the atmospheric side. If the atmospheric pressure is 758 Torr, what is the pressure of the gas sample (in bar)?

Accepted Answer

The answer of The level of mercury on the sample...

Question 3

A tank holds a mixture of nitrogen and chlorine gases. If the partial pressure of nitrogen is 3.3 atm and the total pressure of the mixture is 22,000 kPa; what is the mole fraction of chlorine gas?

Accepted Answer

Dalton's l

Question 4

A tank is pressurized with 5.0 atm of N2 and 10.0 atm of H2. Ammonia (NH3) is formed. When the pressure finally remains constant, indicating that the reaction has proceeded as far as it will go, the partial pressure of ammonia is 3.2 atm. What is the total pressure in the tank assuming that neither the temperature nor the volume of the container have changed?

Accepted Answer

Question 5

If the density of a sample of nitrogen gas was 1.2 g/L at 298K; what is the density of chlorine gas at 298K if the pressure of the chlorine gas is twice that of the nitrogen?

Accepted Answer

The answer of If the density of a sample of...

Question 6

A diver exhales a bubble with a volume of 250 ml at a pressure of 2.4 atm and 15˚C. What will be the volume of that bubble when it reaches the surface where the pressure if 1 atm and the temperature if 29˚C?

Accepted Answer

The answer of A diver exhales a bubble with a...

Question 7

The following set up is arranged in a laboratory. Assuming the volume of the connecting tubing is negligible and there is no temperature change, determine the final total pressure if all three flasks were allowed to mix.

Accepted Answer

A)  1.0 bar 
B)  1.8 bar 
C)  0.69 bar 
D)  1.9 bar 
E)  5.7 bar 
A)  1.0 bar 
B)  1.8 bar 
C)  0.69 bar 
D)  1.9 bar 
E)  5.7 bar

Question 8

A sample of gas is cooled from 273°C to 0°C. Which of the following statements accurately describes the sample at its new conditions?
1) The kinetic energy is now nearly zero.
2) The average velocity is now twice as fast.
3) The average velocity is half as fast.
4) The average kinetic energy is halved.
5) The average velocity is about two thirds of the original.

Accepted Answer

A)  1 only 
B)  3 only 
C)  2 and 4 only 
D)  4 and 5 only 
E)  2 and 5 only 
A)  1 only 
B)  3 only 
C)  2 and 4 only 
D)  4 and 5 only 
E)  2 and 5 only

Question 9

A sample of gas is heated from 200 K to 400 K. Which of the following statements accurately describes the sample at its new conditions?
1) The average velocity is twice as fast.
2) The molecules have four times the kinetic energy.
3) The average velocity is nearly the same.
4) The average kinetic energy is half the original.
5) The kinetic energy is twice the original.

Accepted Answer

A)  1 and 5 only 
B)  3, 4 and 5 only 
C)  2 and 5 only 
D)  3 and 5only 
E)  5 only 
A)  1 and 5 only 
B)  3, 4 and 5 only 
C)  2 and 5 only 
D)  3 and 5only 
E)  5 only

Question 10

Ground level ozone

Accepted Answer

A)  forms the ozone layer which protects animal and plant life from harmful solar radiation. 
B)  is a contributor to photochemical smog. 
C)  is harmful to the respiratory system. 
D)  both a and b. 
E)  both b and c. 
A)  forms the ozone layer which protects animal and plant life from harmful solar radiation. 
B)  is a contributor to photochemical smog. 
C)  is harmful to the respiratory system. 
D)  both a and b. 
E)  both b and c.

Question 11

A cylinder of carbon dioxide is shipped to a research facility. This cylinder is under a pressure of 145 atm and has a volume of 95 litres. What volume would this same amount of gas fill if the valve was opened to the room, which is under a pressure of 745 mm Hg?

Accepted Answer

The answer of A cylinder of carbon dioxide is shipped...

Question 12

If the rate of effusion of Kr is 5 x 10-5 moles/s, what is the rate of effusion of chlorine gas under identical conditions in units of molecules/s?

Accepted Answer

3.3 x 10¹⁹ m

Question 13

If the density of a sample of nitrogen gas was 8.0 x 10-3 g/L, what is the density of He under identical conditions of temperature and pressure?

Accepted Answer

Question 14

One group of compounds that contain only carbon and hydrogen are called the cycloalkanes and have the empirical formula CH2. The vapour from a sample of one of these compounds occupies a volume of 253.2 mL at a temperature of 99.8°C and a pressure of 754.8 Torr. The vapour has a mass of 0.5921g. What is the molecular formula of the compound?

Accepted Answer

MM = 72.1

Question 15

At an elevation of 10 km above sea level (about 33,000 feet, approximately the cruising altitude of a jet airliner), the atmospheric pressure is 210 Torr and the temperature is 230K. Assuming air is 21% O2, how many L of air at this altitude would be required to completely burn 1 kg of jet fuel, C12H26?

Accepted Answer

Question 16

A sample of N2 gas is contaminated with a gas. It is found that that contaminant effuses at 0.36 times the rate of N2. What is the contaminating gas?

Accepted Answer

A)  He 
B)  Cl2 
C)  H2 
D)  Kr 
E)  Rn 
A)  He 
B)  Cl2 
C)  H2 
D)  Kr 
E)  Rn

Question 17

A sample of oxygen is expected to diffuse ______ than chlorine gas.

Accepted Answer

A)  1.5 times faster 
B)  1.5 times slower 
C)  0.66 times as fast 
D)  1.05 times faster 
A)  1.5 times faster 
B)  1.5 times slower 
C)  0.66 times as fast 
D)  1.05 times faster

Question 18

A steel cylinder 1.2 m tall and 20 cm in diameter is filled with nitrogen at a pressure of 152 bar at a temperature of 24°C. How many kg of nitrogen does the cylinder contain?

Accepted Answer

The answer of A steel cylinder 1.2 m tall and...

Question 19

In the summer there is frequently dew on the grass on humid nights. What will the dew point be if during the afternoon there was a relative humidity of 78% at 32˚C (90˚F)?

Accepted Answer

The answer of In the summer there is frequently dew...

Question 20

Professional cyclists can metabolize more than 80 mL of oxygen per kg of body weight per minute (sometimes called the V-O2 max). Calculate the mass of glucose (in grams) that could theoretically be consumed by the following reaction by a 70 kg cyclist in an hour (assume 25oC and 1 atm pressure).
C6H12O6 + 6 O2  $\rarr$  6 CO2 + 6 H2O

Accepted Answer

A)  2.28 
B)  41 
C)  410 
D)  4100 
E)  6.8 
A)  2.28 
B)  41 
C)  410 
D)  4100 
E)  6.8

At 1000°C and 10.0 Torr, the density of a certain element in the gas phase is 2.9 x 10^-3 g/L. What is the element?

The level of mercury on the sample side of a manometer is 156 mm below that of the atmospheric side. If the atmospheric pressure is 758 Torr, what is the pressure of the gas sample (in bar)?

A tank holds a mixture of nitrogen and chlorine gases. If the partial pressure of nitrogen is 3.3 atm and the total pressure of the mixture is 22,000 kPa; what is the mole fraction of chlorine gas?

If the density of a sample of nitrogen gas was 1.2 g/L at 298K; what is the density of chlorine gas at 298K if the pressure of the chlorine gas is twice that of the nitrogen?

A diver exhales a bubble with a volume of 250 ml at a pressure of 2.4 atm and 15˚C. What will be the volume of that bubble when it reaches the surface where the pressure if 1 atm and the temperature if 29˚C?

The following set up is arranged in a laboratory. Assuming the volume of the connecting tubing is negligible and there is no temperature change, determine the final total pressure if all three flasks were allowed to mix.

Ground level ozone

A cylinder of carbon dioxide is shipped to a research facility. This cylinder is under a pressure of 145 atm and has a volume of 95 litres. What volume would this same amount of gas fill if the valve was opened to the room, which is under a pressure of 745 mm Hg?

If the rate of effusion of Kr is 5 x 10^-5moles/s, what is the rate of effusion of chlorine gas under identical conditions in units of molecules/s?

If the density of a sample of nitrogen gas was 8.0 x 10^-3g/L, what is the density of He under identical conditions of temperature and pressure?

A sample of N₂ gas is contaminated with a gas. It is found that that contaminant effuses at 0.36 times the rate of N₂. What is the contaminating gas?

A sample of oxygen is expected to diffuse ______ than chlorine gas.

A steel cylinder 1.2 m tall and 20 cm in diameter is filled with nitrogen at a pressure of 152 bar at a temperature of 24°C. How many kg of nitrogen does the cylinder contain?

In the summer there is frequently dew on the grass on humid nights. What will the dew point be if during the afternoon there was a relative humidity of 78% at 32˚C (90˚F)?

Fundamental Concepts of Chemistry

Energy and Its Conservation

Atoms and Light

Atomic Energies and Periodicity

Fundamentals of Chemical Bonding

Theories of Chemical Bonding

Effects of Intermolecular Forces

Properties of Solutions

Organic Chemistrystructure

Organic Chemistryreactions

Spontaneity of Chemical Processes

Kinetics: Mechanisms and Rates of Reactions

Principles of Chemical Equilibrium

Aqueous Acidbase Equilibria

Applications of Aqueous Equilibria

Electron Transfer Reactions

Macromolecules

The Transition Metals

The Main Group Elements

Nuclear Chemistry and Radiochemistry

Filters

Exam 2: The Behaviour of Gases

At 1000°C and 10.0 Torr, the density of a certain element in the gas phase is 2.9 x 10-3 g/L. What is the element?

The level of mercury on the sample side of a manometer is 156 mm below that of the atmospheric side. If the atmospheric pressure is 758 Torr, what is the pressure of the gas sample (in bar)?

A tank holds a mixture of nitrogen and chlorine gases. If the partial pressure of nitrogen is 3.3 atm and the total pressure of the mixture is 22,000 kPa; what is the mole fraction of chlorine gas?

If the density of a sample of nitrogen gas was 1.2 g/L at 298K; what is the density of chlorine gas at 298K if the pressure of the chlorine gas is twice that of the nitrogen?

A diver exhales a bubble with a volume of 250 ml at a pressure of 2.4 atm and 15˚C. What will be the volume of that bubble when it reaches the surface where the pressure if 1 atm and the temperature if 29˚C?

The following set up is arranged in a laboratory. Assuming the volume of the connecting tubing is negligible and there is no temperature change, determine the final total pressure if all three flasks were allowed to mix.

Ground level ozone

A cylinder of carbon dioxide is shipped to a research facility. This cylinder is under a pressure of 145 atm and has a volume of 95 litres. What volume would this same amount of gas fill if the valve was opened to the room, which is under a pressure of 745 mm Hg?

If the rate of effusion of Kr is 5 x 10-5 moles/s, what is the rate of effusion of chlorine gas under identical conditions in units of molecules/s?

If the density of a sample of nitrogen gas was 8.0 x 10-3 g/L, what is the density of He under identical conditions of temperature and pressure?

A sample of N2 gas is contaminated with a gas. It is found that that contaminant effuses at 0.36 times the rate of N2. What is the contaminating gas?

A sample of oxygen is expected to diffuse ______ than chlorine gas.

A steel cylinder 1.2 m tall and 20 cm in diameter is filled with nitrogen at a pressure of 152 bar at a temperature of 24°C. How many kg of nitrogen does the cylinder contain?

In the summer there is frequently dew on the grass on humid nights. What will the dew point be if during the afternoon there was a relative humidity of 78% at 32˚C (90˚F)?

Fundamental Concepts of Chemistry

Energy and Its Conservation

Atoms and Light

Atomic Energies and Periodicity

Fundamentals of Chemical Bonding

Theories of Chemical Bonding

Effects of Intermolecular Forces

Properties of Solutions

Organic Chemistrystructure

Organic Chemistryreactions

Spontaneity of Chemical Processes

Kinetics: Mechanisms and Rates of Reactions

Principles of Chemical Equilibrium

Aqueous Acidbase Equilibria

Applications of Aqueous Equilibria

Electron Transfer Reactions

Macromolecules

The Transition Metals

The Main Group Elements

Nuclear Chemistry and Radiochemistry

Filters

At 1000°C and 10.0 Torr, the density of a certain element in the gas phase is 2.9 x 10^-3 g/L. What is the element?

If the rate of effusion of Kr is 5 x 10^-5moles/s, what is the rate of effusion of chlorine gas under identical conditions in units of molecules/s?

If the density of a sample of nitrogen gas was 8.0 x 10^-3g/L, what is the density of He under identical conditions of temperature and pressure?

A sample of N₂ gas is contaminated with a gas. It is found that that contaminant effuses at 0.36 times the rate of N₂. What is the contaminating gas?