Question

A 100 cm³ gas cylinder filled with chlorine under 160 torr pressure is connected by stop cock with another cylinder of 400cm³ filled with nitrogen under pressure of 200 torr. What will be the total pressure when stop cock is opened.

Answer 1

Calculate the pressure of each gas as it expands into the total new volume:

P1V1 = P2V2

Chlorine:

160 torr X 100 cm^3 = P2 X 500 cm^3

P2 = 32 tirr

Nitrogen:

200 torr X 400 cm^3 = P2 X 500 cm^3

P2 = 160 torr

The total pressure will be the sum of those two partial pressures, to, the total pressure is

P = 160 torr + 32 torr = 192 torr