TON2011 June 2018 Examination A [3] e) Change in enthalpy. 1) Change in entropy. [3] QUESTION 4 (31) A container holds a mixture of gases consisting of 30 % Nitrogen (molar mass 28), 50 % Oxygen (molar mass 32) and 20 % Hydrogen (molar mass= 2) by mass. The volume of the container is 0.5 m and the temperature of the mixture is 40 C Calculate the total pressure in the container and the mole fraction for each gas. [31] QUESTION 5 (7) 1 kg of steam at 20 bar and dryness fraction 0.9 is heated reversible at constant pressure to a temperature of 300 C. Calculate the change in entropy. [7]