A sample of air contains Nitrogen, Oxgen and saturated with water vapour under a total pressure of 640mm. If the vapour pressure of water at that temperature is 40mm 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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600 mm

160 mm

480 mm

450 mm

answer is C.

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Detailed Solution

$\begin{array}{l} P_{N_{2}} + P_{O_{2}} + P_{H_{2} O} = 640 mm \\ P_{N_{2}} + P_{O_{2}} = 640 - 40 = 600 mm \\ P N_{2} = \frac{3}{4} \times 600 = 450 mm \end{array}$

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