For the diffusion of a gas at pressure $P$,the rate of diffusion is expressed by :

  • A
    $r \propto \frac{1}{\sqrt{M}}$
  • B
    $r = \frac{P}{M}$
  • C
    $r \propto \frac{M}{\sqrt{P}}$
  • D
    $r \propto \frac{P}{\sqrt{M}}$

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Air contains $70\% \, N_2, \, 20\% \, O_2$ and $1\% \, CO_2$ by volume. If the total pressure of air is $1 \, bar$,find the partial pressure of $N_2, O_2$ and $CO_2$.

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$A$ gaseous mixture contains $65\%$ $N_2$,$15\%$ $O_2$,and $20\%$ $CO_2$ by volume at a total pressure of $760 \, mm \, Hg$. Calculate the partial pressure of each gas in $mm \, Hg$.

The total pressure exerted by a mixture of non-reacting gases is equal to the sum of the partial pressures of the individual gases under the same conditions. This is known as:

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