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

Question

A sample of air contains only $N_2$, $O_2$ and $H_2O$. It is saturated with water vapour and 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

Prashant Kotian · Accepted Answer

Correct answer: D. Pressure of dry air = 640 - 40 = 600 torr . Mole fraction of in dry air = 3/4 . Partial pressure of = (3/4) * 600 = 450 torr .

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