Question

A mixture of hydrogen, nitrogen, and water vapor has a total pressure of 864 mmHg.


The partial pressure of hydrogen is 220 mmHg and that of nitrogen is 410 mmHg.


What is the partial pressure of water vapor?

Answer 1

As per Dalton's law of Partial pressure,

The total pressure of a mixture of gases is equal to sum of partial pressure of individual components of the mixture.

So,$P=P_H+P_N+P_W$

$\implies 864\ mm=220\ mm+410\ mm+P_W\implies$ $P_W=864-630=234$ mm of Hg.