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A sample of air contains only N2 ,O2 and...

A sample of air contains only `N_2 ,O_2 and H_2O`. It is saturated with water vapours and the total pressure is 640 torr. The vapour pressure of water is 40 torr and the molar ratio of `N_2 : O_2` is 3: 1. The partial pressure of `N_2` in the sample is

A

480 torr

B

600 torr

C

525 torr

D

450 torr

Text Solution

Verified by Experts

The correct Answer is:
D
Pressure of dry air = `P_("moist air") - P_("water vapours")`
` 640 - 40 = 600` torr
Partial pressure `prop` mole fraction
`:.` Partial pressure of `N_2 and O_2 ` are also in the ratio `3:1`
Partial pressure of `N_2 = (600 xx 3)/(3 +1) = 450` torr.
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