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 $	ext{N}_2$, $	ext{O}_2$ and $	ext{H}_2	ext{O}$. It is saturated with water vapour and pressure is 640 torr. The vapour pressure of water is 40 torr and the molar ratio of $	ext{N}_2$:$	ext{O}_2$ is 3:1. The partial pressure of $	ext{N}_2$ in the sample is

Prashant Kotian · Accepted Answer

Correct answer: D. Dry air = 640 - 40 = 600 torr. N2 fraction = 3/4. N2 pressure = 3/4 * 600 = 450 torr. Therefore, correct answer is D.

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