0.1 (a) Define the term Enthalpy and show that AH = 4p. 2 (b) Give the statement of Hess' Law of constant heat summation, taking a suitable example. 2 (c) Draw the energy diagram of exothermic and endothermic reaction. 2 (d) Derive the relationship between Cp and Cy. 2.5 (e) Calculate the maximum work obtained when 56 g of nitrogen were expanded g isothermally reversibly from 10 litres to 20 litres at 25C. 1.5