A storage tank is being vented to the atmosphere, it contains a mixture of 70% acetone and 30% benzene. What temperature should the tank be kept at to ensure that the vapour space that is above the liquid has a concentration less than 7*10^-5 mol/m^3 of VOCs.

The mixture can be treated as an ideal gas.

Acetone: ln(P) = 10 2941/(T 35.96)

Benzene: ln(P) = 4.7 1661/(T 1.461)

P is in bar

T is in Kelvin