A sample of air contains Nitrogen, Oxyge...

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

480 mm.

600 mm

450 mm.

160 mm.

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