Exam 5: Gases

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A) 1.16 × 10²²
B) 1.16 × 10²³
C) 2.32 × 10²⁴
D) 5.8 × 10²²
E) none of these

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A) 0.00 L, 0.00 L, 5.00 L, and 30.0 L
B) 0.00 L, 0.00 L, 7.50 L, and 45.0 L
C) 0.00 L, 5.00 L, 7.50 L, and 45.0 L
D) 5.00 L, 0.00 L, 5.00 L, and 30.0 L
E) 0.00 L, 10.0 L, 15.0 L, and 90.0 L

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A) 1.25 g/L
B) 0.625 g/L
C) 0.312 g/L
D) 1.60 g/L
E) 0.800 g/L

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A) CH₄ < NO₂ < NO < F₂ < Cl₂
B) Cl₂ < F₂ < NO₂ < CH₄ < NO
C) Cl₂ < NO₂ < F₂ < NO < CH₄
D) CH₄ < NO < F₂ < NO₂ < Cl₂
E) F₂ < NO < Cl₂ < NO₂ < CH₄

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A)
B) A and D
C)
D)
E)

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A) 0.538 atm
B) 1.36 atm
C) 0.839 atm
D) 0.891 atm
E) none of these

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A) If a second mole of argon is added to the cylinder, the ratio T/P will remain constant.
B) If the temperature of the cylinder is changed from 25°C to 50°C, the pressure inside the cylinder will double.
C) A cylinder of identical volume filled with the same pressure of helium must contain more atoms of gas because He has a smaller atomic radius than argon.
D) Two of these are correct.
E) None of these is correct.

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A) gas particles are very small compared to the average distance between the particles.
B) gas particles collide with the walls of their container in elastic collisions.
C) the average velocity of gas particles is directly proportional to the absolute temperature.
D) gases are made up of tiny particles in constant chaotic motion.
E) All of these are correct.

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A) 1.41
B) 0.505
C) 1.98
D) 1.00
E) none of these

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A) B₂H₆
B) B₄H₁₀
C) B₅H₁₄
D) B₃H₁₂
E) BH₃

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A) 180
B) 32
C) 0.18
D) 1.0
E) 5.6

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A) He
B) Cl₂
C) CH₄
D) NH₃
E) The collisions are elastic for all the gases.

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A) The molecules in all the flasks have the same momentum per impact.
B) flask C
C) The molecules in two of the flasks have the same momentum per impact.
D) flask A
E) flask B

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A) 0.675 atm
B) 0.878 atm
C) 1.32 atm
D) 1.35 atm
E) 0.473 atm

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A) 135 L
B) 329 L
C) 82.2 L
D) 67.2 L
E) none of these

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A) The relationship depends on the gas.
B) They are equal.
C) The observed pressure is greater than the ideal pressure.
D) The observed pressure is less than the ideal pressure.
E) none of these

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A) Assuming identical intermolecular forces in the two samples, sample A should be more nearly ideal than sample B.
B) The root-mean-square velocity of molecules in sample A is twice as large as the root-mean-square velocity of molecules in sample B.
C) The average kinetic energy of the molecules in sample A is twice the average kinetic energy of the molecules in sample B.
D) The fraction of molecules in sample A having a kinetic energies greater than some high fixed value is larger than the fraction of molecules in sample B having kinetic energies greater than that same high fixed value.
E) The volume of sample A is twice the volume of sample B.

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