Question

A gas mixture containing oxygen, nitrogen, and helium exerts a total pressure of 925 torr .

If the partial pressures are oxygen 445 torr and helium 50 torr, what is the partial pressure (torr) of the nitrogen in the mixture?

Answer 1

$P=p(O_2)+p(N_2)+p(He)$

$p(N_2)=P-p(O_2)-p(He)$

$p(N_2)=(925-445-50)torr=330torr$

$p(N_2)=330torr$