9. 1400 1200 1000 AH" (cal/mole) 800 600 400 200 0,0 0,2 0,4 0,6 0,8 1,0 X, Heat of mixing (AHM) of liquid A-B alloys at 1500C is schematically shown in the figure above. The figure shows that AHM varies linearly in the 0.2sXs0.4 region with AH-850 cal/mole for X 0.2 and AHM-1150 cal/mole for X 0.4. a) Find relative partial molar enthalpies of A and B at 1500C for X 0.3. b) Calculate the heat effect of adding two moles of pure liquid B at 1500C into A very large liquid A-B solution in which X0.2 at 1500C. 6 moles of a liquid A-B solution in which X 0.2 at 1500'C. State the quantity of heat to be removed from or to be supplied to the system so that the temperature will remain constant at 1500C for both of the cases. c) If the excess molar entropy of liquid A-B alloys at 1500C is given as: 5*--0.5XX. cal/mole-K, find the activities and activity coefficients of A and B, referred to pure liquids as the standard states, in aliquid A-B solution in which X 0.3