3. Consider an ideal solution composed of A and B. The binary two-phase diagram is shown below. The initial liquid mixture 1 has a mole fraction xA=0.5 and the total moles of the liquid mixture are 120 moles (i.e. nA+ nB=120mol ). When this ideal solution is heated and reached to the equilibrium at the liquid phase 2 in the following diagram, what is the amount (mole) of A and B in gas phase, respectively