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Gas effusion rate

What will be the ratio of the rate effusion of carbon dioxide to the rate of effusion of nitrogen gas?
Soln.

By using Graham’s effusion rate law:

M.wt CO2 = 44 g/mol M.wt N2 = 28 g/mol

\frac{R_(CO2)}{R_(N2)} = \sqrt{\frac{M N_2}{M CO_2}}

\frac{R_(CO2)}{R_(N2)} = \sqrt{\frac{28}{44}} = 0.798

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