Question

A 1.00 L vessel contains 5 g N2 and 1.5 g H2O at 25 degrees C. Calculate the mass of LIQUID water that would be present in the vessel.

Answer 1

The vapor pressure of H2O at 25C is 23.8 mm Hg. Plug that into PV = nRT and solve for n = mols H2O vapor. Subtract from mols in the 1.5g initially present to find mols H2O liquid.