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A sample of air contains only N(2), O(2)...

A sample of air contains only `N_(2), O_(2) and H_(2)O`. 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
Total pressure of mixture of `N_(2), O_(2)` and `H_(2)O` is 640 torr.
Since vapour pressure of water = 40 torr
Hence pressure of `N_(2)` and `V_(2)`
`= 640 - 40 = 450` torr
Partial pressure of `N_(2)`
= mole fraction of `N_(2) xx` total pressure
`= 3//4 xx 600 = 450` torr
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