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SAT Chemistry

Category - Multiple Choice

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According to Grahm’s law, which of the following gases would effuse through a small hole in a closed container the fastest?

H₂(g)
O₂(g)
CO₂(g)
PCl₃(g)
N₂(g)

Explanation

Answer: H₂(g)

According to Grahm’s law, a gas effuses at a rate inversely proportional to the square root of its mass. Thus, the lightest gas, H₂, will effuse the fastest.

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