A sample of air contains nitrogen, oxygen and saturated with water vapour under a total pressure of 640 mm if the vapour pressure of water at that temperature is 40 mm and the molecular ratio of $N_{2} : O_{2}$ is $3 : 1$ the partial pressure of nitrogen in the sample is?

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450 mm

600 mm

160 mm

480 mm

answer is C.

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Detailed Solution

$P_{d r y} = p_{m o i s t} - A q t e n s i o n \Rightarrow 640 - 40 = 600 P_{N_{2}} = x_{N_{2}} \times P_{t o t a l} \Rightarrow P_{N_{2}} = \frac{3}{4} \times 600 = 450 m m$

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