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A specified quantity of an unknown gas has the volume of 14.1 mL at 22°C and 659 torr. Calculate the volume at STP.


A) 0.912 mL
B) 13.2 mL
C) 11.3 mL
D) 15.0 mL
E) none of these

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Zinc metal is added to hydrochloric acid to generate hydrogen gas and is collected over a liquid whose vapor pressure is the same as that of pure water at 20.0°C (18 torr) . The volume of the mixture is 1.7 L, and its total pressure is 0.788 atm. Determine the number of moles of hydrogen gas present in the sample.


A) 0.792 mol
B) 0.111 mol
C) 0.216 mol
D) 0.0540 mol
E) 0.0318 mol

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A vessel with an internal volume of 15.3 L contains 2.80 g of nitrogen gas, 0.403 g of hydrogen gas, and 79.9 g of argon gas. At 25oC, what is the pressure (in atm) inside the vessel?


A) 860 atm
B) 0.308 atm
C) 3.68 atm
D) 0.272 atm
E) 133 atm

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You have a sample of argon gas at a certain pressure, volume, and temperature. You double the volume, double the number of moles of argon, and double the Kelvin temperature. How does the final pressure (Pf) compare to the original pressure (Po) ? Pf =


A) (1/8) Po
B) (1/2) Po
C) 2Po
D) 4Po
E) 8P2

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A flexible weather balloon contains helium gas at a volume of 855 L. Initially, the balloon is at sea level, where the temperature is 25oC and the barometric pressure is 0.947 atm. The balloon then rises to an altitude of 5500 ft, where the pressure is 0.785 atm and the temperature is 15oC. What is the change in the volume of the balloon as it ascends from sea level to 5500 ft?


A) A flexible weather balloon contains helium gas at a volume of 855 L. Initially, the balloon is at sea level, where the temperature is 25<sup>o</sup>C and the barometric pressure is 0.947 atm. The balloon then rises to an altitude of 5500 ft, where the pressure is 0.785 atm and the temperature is 15<sup>o</sup>C. What is the change in the volume of the balloon as it ascends from sea level to 5500 ft? A) L B) L C) L D) L E) L L
B) A flexible weather balloon contains helium gas at a volume of 855 L. Initially, the balloon is at sea level, where the temperature is 25<sup>o</sup>C and the barometric pressure is 0.947 atm. The balloon then rises to an altitude of 5500 ft, where the pressure is 0.785 atm and the temperature is 15<sup>o</sup>C. What is the change in the volume of the balloon as it ascends from sea level to 5500 ft? A) L B) L C) L D) L E) L L
C) A flexible weather balloon contains helium gas at a volume of 855 L. Initially, the balloon is at sea level, where the temperature is 25<sup>o</sup>C and the barometric pressure is 0.947 atm. The balloon then rises to an altitude of 5500 ft, where the pressure is 0.785 atm and the temperature is 15<sup>o</sup>C. What is the change in the volume of the balloon as it ascends from sea level to 5500 ft? A) L B) L C) L D) L E) L L
D) A flexible weather balloon contains helium gas at a volume of 855 L. Initially, the balloon is at sea level, where the temperature is 25<sup>o</sup>C and the barometric pressure is 0.947 atm. The balloon then rises to an altitude of 5500 ft, where the pressure is 0.785 atm and the temperature is 15<sup>o</sup>C. What is the change in the volume of the balloon as it ascends from sea level to 5500 ft? A) L B) L C) L D) L E) L L
E) A flexible weather balloon contains helium gas at a volume of 855 L. Initially, the balloon is at sea level, where the temperature is 25<sup>o</sup>C and the barometric pressure is 0.947 atm. The balloon then rises to an altitude of 5500 ft, where the pressure is 0.785 atm and the temperature is 15<sup>o</sup>C. What is the change in the volume of the balloon as it ascends from sea level to 5500 ft? A) L B) L C) L D) L E) L L

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Which of the following statements is true about the kinetic molecular theory?


A) The volume of a gas particle is considered to be small: about 0.10 mL.
B) Pressure is due to the collisions of the gas particles with the walls of the container.
C) Gas particles repel each other but do not attract one another.
D) Adding an ideal gas to a closed container will cause an increase in temperature.
E) At least two of these statements are correct.

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A sample of a gas in a container fitted with a piston has a temperature above 0°C. The Celsius temperature is doubled. What is true about the ratio of final volume to initial volume for the gas?


A) It is 1:1.
B) It is 2:1.
C) It is 1:2.
D) It is greater than 2:1.
E) It is less than 2:1.

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A gaseous compound containing carbon and hydrogen was analyzed and found to consist of between 80 and 90 percent carbon by mass. At 145ºC and 1.00 atm, the density of this compound is 2.45 g/L. What is the molar mass of the compound?


A) 84.2 g/mol
B) 29.2 g/mol
C) 55.0 g/mol
D) 99.1 g/mol
E) 42.1 g/mol

Correct Answer

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What volume is occupied by 22.6 g of methane, CH4, at 27°C and 1.59 atm?


A) 34.7 L
B) 21.8 L
C) 1.96 L
D) 31.5 L
E) not enough data to calculate

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Solid carbon dioxide is placed into a Ziploc bag. At a certain temperature, solid carbon dioxide sublimes (turns directly from a solid to a gas) at a rate of 0.726 g/minute. How many gaseous carbon dioxide molecules are present after 4.84 minutes?


A) Solid carbon dioxide is placed into a Ziploc bag. At a certain temperature, solid carbon dioxide sublimes (turns directly from a solid to a gas) at a rate of 0.726 g/minute. How many gaseous carbon dioxide molecules are present after 4.84 minutes? A) B) C) D) E)
B) Solid carbon dioxide is placed into a Ziploc bag. At a certain temperature, solid carbon dioxide sublimes (turns directly from a solid to a gas) at a rate of 0.726 g/minute. How many gaseous carbon dioxide molecules are present after 4.84 minutes? A) B) C) D) E)
C) Solid carbon dioxide is placed into a Ziploc bag. At a certain temperature, solid carbon dioxide sublimes (turns directly from a solid to a gas) at a rate of 0.726 g/minute. How many gaseous carbon dioxide molecules are present after 4.84 minutes? A) B) C) D) E)
D) Solid carbon dioxide is placed into a Ziploc bag. At a certain temperature, solid carbon dioxide sublimes (turns directly from a solid to a gas) at a rate of 0.726 g/minute. How many gaseous carbon dioxide molecules are present after 4.84 minutes? A) B) C) D) E)
E) Solid carbon dioxide is placed into a Ziploc bag. At a certain temperature, solid carbon dioxide sublimes (turns directly from a solid to a gas) at a rate of 0.726 g/minute. How many gaseous carbon dioxide molecules are present after 4.84 minutes? A) B) C) D) E)

Correct Answer

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You have a certain mass of helium gas in a rigid steel container. You add the same mass of neon gas to this container. Which of the following best describes what happens? Assume temperature is constant.


A) The pressure in the container doubles.
B) The pressure in the container increases but does not double.
C) The pressure in the container more than doubles.
D) The volume of the container doubles.
E) The volume of the container more than doubles.

Correct Answer

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A gas occupies 30.3 L at 2.00 atm pressure and 27°C. How many moles of gas are present in the sample?


A) 27.4 mol
B) 1.23 mol
C) 2.46 mol
D) 3.96 mol
E) 4.86 mol

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You are holding two balloons of the same volume. One balloon contains 1.05 g helium. The other balloon contains neon. What is the mass of neon in the balloon?


A) 0.262 g
B) 1.05 g
C) 76.9 g
D) 5.29 g
E) 20.0 g

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You fill a balloon with 10.0 g of N2 gas. You wish to add 10.0 g of another gas to make the balloon more than twice as large as it is with only the N2 (that is, more than twice the original volume) . Which gas should you add (assume constant temperature) ?


A) O2
B) CO2
C) CO
D) He
E) You cannot make the balloon more than twice as large with 10.0 g of any gas.

Correct Answer

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Two moles of gas A spontaneously convert to 3 moles of gas B in a container where the temperature and pressure are held constant. The sample originally took up 36.2 L of volume. What is the new volume of the products?


A) 24.1 L
B) 109 L
C) 72.4 L
D) 7.24 L
E) 54.3 L

Correct Answer

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When analyzing ideal gases, the temperature must be measured on the Kelvin scale


A) because otherwise you could calculate a negative volume.
B) so that you are using an absolute scale.
C) to directly measure the average kinetic energy of the gas particles.
D) Both a and b are correct.
E) a, b, and c are correct.

Correct Answer

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A 6.08-g piece of solid CO2 (dry ice) is allowed to vaporize (change to CO2(g) ) in a balloon. The final volume of the balloon is 1.00 L at 300. K. What is the pressure of the gas?


A) 3.40 atm
B) 6.50 atm
C) 0.306 atm
D) 153 atm
E) none of these

Correct Answer

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You are playing with a helium balloon on a typically warm California day. Suddenly, the Celsius temperature doubles. Which of the following is true?


A) The volume of the balloon will double.
B) The volume of the balloon will slightly increase.
C) The pressure inside the balloon will double.
D) The volume of the balloon will decrease.
E) The actual temperatures are needed to answer this question.

Correct Answer

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Perform the following conversion of pressure units: 232 kPa = ____________ Pa


A) 0.232
B) Perform the following conversion of pressure units: 232 kPa = ____________ Pa A) 0.232 B) C) 2.32 D) E)
C) 2.32
D) Perform the following conversion of pressure units: 232 kPa = ____________ Pa A) 0.232 B) C) 2.32 D) E)
E) Perform the following conversion of pressure units: 232 kPa = ____________ Pa A) 0.232 B) C) 2.32 D) E)

Correct Answer

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You are holding two balloons, an orange balloon and a blue balloon. The orange balloon is filled with neon (Ne) gas, and the blue balloon is filled with argon (Ar) gas. The orange balloon has twice the volume of the blue balloon. Which of the following best represents the mass ratio of Ne:Ar in the balloons?


A) 1:1
B) 1:2
C) 2:1
D) 1:3
E) 3:1

Correct Answer

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