[kelaklub]

The following is a practise test question...

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Question

The diffusion rate of methane gas compared to that of helium is...

A) twice as fast
B) 4 times as slow
C) 4 time as fast
D) half as fast
E) 12 times as fast

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The answer is supposed to be choice D. But I picked choice B, basing the diffusion rate on the atomic weights.

So does diffusion rate only depend on the number of elements present, 2 in methane (C and H), and He. Thanks.

[Borek]

Graham's Law of Effusion

[kelaklub]

Aaah, the square root. Thank you very much.