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 N2:O2 is 3:1, the partial pressure of Nitrogen in the sample is

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480 mm.

600 mm.

450 mm.

160 mm.

answer is C.

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Detailed Solution

PN2+O2=Pmoist gas−aq.tension =640−40 =600 mm PN2=X2P =nN2nN2+nO2P =(33+1)600 PN2=450 mm

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