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A sample of air contains nitrogen, oxyge...

A sample of air contains nitrogen, oxygen and saturated with water vapour under a total pressure of 640mm. If the vapour pressure of water at that temperature is 40mm and mole ratio of `N_2` : `O_2` is 3:1 , the partial pressure of nitrogen in the sample is
A) 480mm
B) 600mm
C) 450mm
D) 160mm

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