A gas diffuses 5/3 faster than carbon dioxide. Which gas might it be?

a. O2

b. N2

c. CO

d. He

e. CH4

Please explain how this is so.

Expert Answers

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According to Graham's Law, the ratio of the diffusion of the two gases is inversely proportional to the molar masses of the two gases.

5/3 = (M/44)^.5

.36 = M/44

M = 16 as the molar mass of the other gas.  That would be CH4

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