Multiple Choice
Gas Y effuses at half the rate of O_2. What is the molar mass of Gas Y?
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7. Gases
Effusion
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Which statement best describes the process of effusion?
A
Effusion is the condensation of a gas into a liquid upon cooling.
B
Effusion is the process by which a liquid turns into a gas at its boiling point.
C
Effusion is the movement of gas molecules through a small hole from one compartment to another without significant collisions.
D
Effusion is the mixing of two gases due to random molecular motion.
Verified step by step guidance1
Step 1: Understand the definition of effusion in the context of gas behavior. Effusion refers to the movement of gas molecules through a tiny opening or hole without collisions between molecules inside the hole.
Step 2: Differentiate effusion from related processes such as diffusion, condensation, and vaporization. Diffusion involves mixing of gases due to random motion, condensation is gas turning into liquid, and vaporization is liquid turning into gas.
Step 3: Recognize that effusion specifically involves gas molecules passing through a small hole from one container to another, where the hole is so small that molecules pass one at a time without colliding within the hole.
Step 4: Recall Graham's law of effusion, which relates the rate of effusion to the molar mass of the gas, emphasizing the kinetic nature of the process.
Step 5: Conclude that the best description of effusion is the movement of gas molecules through a small hole from one compartment to another without significant collisions.
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