For example 13.17(i), the answer given in the book, heat of vapourisation H_c = 532Kcal/Kg and the deviation as 1.3 %
		      but i am getting H_c = 1234.397 Kcal/Kg,using the Vishwanath and Kuloor method
		      and the deviation is 56.335 %.There might be some calculation mistake in the book.