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
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