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(D) According to Dalton's law of partial pressure,the partial pressure of a gas is directly proportional to its mole fraction,which is proportional to

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$2.96, 11.25$

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(D) According to Dalton's law of partial pressure,the partial pressure of a gas is directly proportional to its mole fraction,which is proportional to the number of moles in a given mass.$(i)$ The ratio of partial pressure of $N_2$ to $O_2$ is $\frac{P_{N_2}}{P_{O_2}} = \frac{n_{N_2}}{n_{O_2}} = \frac{70/28}{27/32} = \frac{2.5}{0.84375} \approx 2.96$.$(ii)$ The ratio of partial pressure of $O_2$ to $Ar$ is $\frac{P_{O_2}}{P_{Ar}} = \frac{n_{O_2}}{n_{Ar}} = \frac{27/32}{3/40} = \frac{0.84375}{0.075} = 11.25$.Thus,the ratios are $2.96$ and $11.25$.

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