Answer to Question #139344 in General Chemistry for javier

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

Dalton’s Law of Partial Pressure states the total pressure exerted by a mixture of gases is equal to the sum of the partial pressure of each individual gas.

Thus;

P_TOTAL = P_O2 + P_H2 + P_N2

925torr. = 445torr + 50torr. + P_N2

PN2 = 925torr - 495torr.

= 430torr.