Exhaust gases leave an internal combustion engine at 800°C and 1 atmosphere, after having done 1050 kJ of work per kg of gas in the engine (cp of gas = 1.1 kJ/kg.K). The temperature of the surroundings is 30°C.
(i) How much available energy per kg of gas is lost by throwing away the exhaust gases?
(ii) What is the ratio of the lost available exhaust gas energy to the engine work?