Question

If intermolecular forces between two different gases were strong, when these gases were mixed the total pressure would be __________ the sum of the two individual gas pressures.

Answer 1

Less than. If the gases are "calmed" and are not moving as much they are not exerting much pressure than as before. The gases would also be heavier if they are interacting with each other and thus they would not be as dynamic and moving around to exert pressure.