Equal moles of hydrogen and oxygen gases are placed in container with a pin-hole through which both can escape. What…

Equal moles of hydrogen and oxygen gases are placed in container with a pin-hole through which both can escape. What fraction of the oxygen escapes in the time required for one-half of the hydrogen to escape?
A $\frac{1}{4}$
B $\frac{3}{8}$
C $\frac{1}{2}$
D $\frac{1}{8}$

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Graham's law of diffusion in past papers

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