The rate of diffusion of hydrogen is......

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(B) According to Graham's Law of Diffusion,the rate of diffusion $(r)$ is inversely proportional to the square root of the molar mass $(M)$: $r \propt

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$1.4$ times that of helium

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(B) According to Graham's Law of Diffusion,the rate of diffusion $(r)$ is inversely proportional to the square root of the molar mass $(M)$: $r \propto \frac{1}{\sqrt{M}}$.For hydrogen $(H_2)$,$M_1 = 2 \ g/mol$.For helium $(He)$,$M_2 = 4 \ g/mol$.Taking the ratio: $\frac{r_{H_2}}{r_{He}} = \sqrt{\frac{M_{He}}{M_{H_2}}} = \sqrt{\frac{4}{2}} = \sqrt{2} \approx 1.414$.Therefore,the rate of diffusion of hydrogen is approximately $1.4$ times that of helium.

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