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

A sample of air contains only `N_(2)O_(2)` and `H_(2)O`. It is saturated with water vapours and 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 :

540torr

900torr

1080torr

450torr

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