Question

We have a tank that contains O2 at 146 mmHg, N2 at 146 mmHg, and CO2 at 138 mmHg. We then add 135 mmHg of Ar. What is the pressure in the tank?

Answer 1

A funny way of putting the problem; if you are saying you add enough Ar to make pressure Ar = 135 mm Hg, the total P in the tank is the sum of the partial pressures of each gas.