Q.

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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a

480 mm.

b

600 mm.

c

450 mm.

d

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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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