Gases

Which one of the following changes would not cause an increase in the pressure of a gaseous system?
1. The container is made larger.
2. Additional amount of the same gas are added to the container.
3. The temperature is increased.
4. Another gas is added to the container.
What happens to the pressure of a gas inside a container if the temperature of the gas is lowered?
1. The pressure increases.
2. The pressure does not change.
3. The pressure decreases
According to kinetic molecular theory, an ideal gas cannot be _________________.
1. liquefied.
2. cooled.
3. heated.
4. pressurized.
A breathing mixture used by deep-sea divers contains helium, oxygen, and carbon dioxide. What is the partial pressure of oxygen at 1 atmosphere if P_He = 609.5mmHg and P_CO2 = 0.5mmHg?
1. 760mmHg
2. 500mmHg
3. 150mmHg
4. 80%
A box with a volume of 22.4L contains 1.0mol of nitrogen and 2.0mol of hydrogen at 0^oC. Which of the following statements is true?
1. The total pressure in the box is 1.0atm.
2. The partial pressures of N₂ and H₂ are equal.
3. The total pressure is 1520mmHg.
4. The partial pressure of N₂ is 1.0atm.
Boyle's law states that _______________.
1. the volume of a gas varies inversely with pressure
2. the volume of a gas varies directly with pressure
3. the temperature of a gas varies directly with pressure
4. the temperature of a gas varies directly with pressure
At a certain temperature and pressure, 0.20mol of CO₂ gas has a volume of 3.1L. A 3.1L sample of hydrogen at the same temperature and pressure ___________________.
1. has the same mass
2. contains the same number of atoms
3. has a higher density
4. contains the same number of molecules.
Which of the following gases is the best choice to serve as the inflating gas of a balloon that must remian inflated for a long period of time?
1. nitrogen
2. oxygen
3. hydrogen
4. neon
5. argon
Under what conditions of temperature and pressure is the behavior of real gases most like that of ideal gases?
1. low temperature and low pressure
2. low temperature and high pressure
3. high temperature and low pressure
4. high temperature and high pressure.
A mixture of gases at a total pressure of 730mmHg contains N₂, CO₂ and O₂. The partial pressure of the CO₂ is 182mmHg and the partial pressure of the N₂ is 365mmHg. What is the partial pressure of the O₂?
1. 183mmHg
2. 1277mmHg
3. 730mmHg
4. 1.33mmHg
A gas storage tank has a volume of 3.5x10⁵m³ when the temperature is 27^oC and the pressure is 1.0atm. What is the new volume of the tank if the temperature drops to -10^oC and the pressure drops to 0.95atm?
1. The gas will experience no change in volume
2. 2.15x10⁴m³
3. 3.23x10⁵m³
4. 4.72x10⁵m³
The gaseous produce of a reaction is collected in a 25.0L container at 27^oC. The pressure in the container is 3.0atm and the gas has a mass of 96.0g. What is the molar mass of the gas?
1. 66g/mol
2. 96g/mol
3. 24g/mol
4. 32g/mol
At 1.00km above sea level, the atmospheric pressure is 675mmHg and the temperature is 282K. If nitrogen comprises 78.1% (mole percent) of air, what is the density of nitrogen at this height?
1. 0.0238g/L
2. 0.521g/L
3. 0.839g/L
4. 1.07g/L
5. 638g/L
If a gas effuses 1.73 times faster than Kr, what is its molar mass?
1. 16.0g/mol
2. 28.0g/mol
3. 36.6g/mol
4. 55.4g/mol
5. 126.9g/mol
Using the van der Waals equation, the pressure in a 22.4L vessel containing 1.00mol of neon gas at 100.^oC is _____________atm ( a = 0.211L²atm/mol², b = 0.0171L/mol)
1. 0.730
2. 1.00
3. 1.21
4. 1.37
5. 0.367
An unknown gas contains 85.6%C and 14.4%H. At 0.455atm and 425K, the gas has a density of 0.549g/L. What is the molecular formula of the gas?
1. CH₄
2. C₂H₄
3. C₃H₆
4. C₄H₆
5. C₄H₈
A mass of 0.650g of calcium carbonate is added to 50.0mL of 0.275M HCl. If the CO_2(g) is collected in a 1.00L flask at 25^oC, what is the pressure of CO_2(g) in the flask?
CaCO_3(s) + 2H⁺_(aq) --> Ca²⁺_(aq) + H₂O_(l) + CO_2(g)
1. 0.0129atm
2. 0.0583atm
3. 0.159atm
4. 0.314atm
5. 15.9atm

Gases

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