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(C) According to Graham's law of diffusion,the rate of diffusion $(r)$ is inversely proportional to the square root of the molar mass $(M)$ of the gas

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$H_2$

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(C) According to Graham's law of diffusion,the rate of diffusion $(r)$ is inversely proportional to the square root of the molar mass $(M)$ of the gas,i.e.,$r \propto \frac{1}{\sqrt{M}}$.Since the pressure is the same,the gas with the lowest molar mass will diffuse or fill the tube the fastest.The molar masses are: $N_2 = 28 \ g/mol$,$O_2 = 32 \ g/mol$,$H_2 = 2 \ g/mol$,and $Ne = 20 \ g/mol$.Since $H_2$ has the lowest molar mass,it will be filled first.

If the four tubes of a car are filled to the same pressure with $N_2$,$O_2$,$H_2$ and $Ne$ separately,then which one will be filled first?

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