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Nitrogen

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Question

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. Find the partial pressure of nitrogen in the sample.

A

480 mm

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B

600 mm

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C

450 mm

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D

160 mm

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Solution

The correct option is C
450 mm

Vapour pressure of ( $O_{2} + N_{2}$ ) = 600 mm

Ratio = 3:1

Partial pressure of $N_{2} = \frac{3}{4} \times 600 = 450 m m$

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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. Find the partial pressure of nitrogen in the sample.

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