please finish this with all the steps

Problem 4: Yet Another Vapour/Liquid Equilibrium Problem A vapour contains 30 mol % nitromethane and 70 mol % methanol at 100C. The vapour-phase is an ideal-gas mixture. a) At what pressure would this mixture first condense if the liquid were an ideal solution? b) Redo part (a) with the liquid solution being non-ideal. c) Calculate the composition of the first drops to condense in part (b). d) Calculate the excess partial molar Gibbs free energy for each component and the excess Gibbs free energy for the solution at the conditions in part (c)