Answer to Question #330088 in General Chemistry for anni

Question

if the partial pressures are oxygen 420 torr and helium 85 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

925 torr = 420 torr + 85 torr. + P_N2

P_N2 = 925 torr - 505 torr = 420 torr.