1.The A-B binary system behaves ideally in both its liquid and solid solutions. The element A melts at 1,500K with the heat of hion of 14,700 Jmor’, and the heat capacity difference, ACP~A (= CpsA(L) – CPA~), is approximately constant aid equal to 4.6 J moIlK-‘. The element B melts at 2,30OK, but the heat of fusion is unknown. The heat capacities of the pure liquid and solid B are equal. It was found in an experiment with a liquid solution of NB = 0.22 that in cooling the fust solid crystals appeared at 1,700K. Calculate the heat of hsion of B.