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9. Calculate the ratio of the rates of effusion of He and Ar ?
ans. 3.6 to 1

A. Determine the relative rates of effusion of He to Ar.
Given: A misture of Ar and He are effusing out of a container.
Know: Grahm's Law of Effusion
To determine the relative rates of Effusion we need to know only the Molar masses of Ar and He.

Molar mass of He ~  4 awu
Molar mass ofAr ~  40 awu