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

Question

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, 480 torr, 600 torr, 525 torr, 450 torr

MARKS App · Accepted Answer

Pressure of dry air = P m o i s t a i r - P w a t e r v a p o u r s Partial pressure = mole fraction × P T ∴ Partial pressure of N 2 and O 2 are also in the ratio of 3 : 1. Partial pressure of N 2 = 600 × 3 3 + 1 = 450 t o r r .

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