1.1. Define the term Entropy and give an example which clearly describes entropy. 1.2. A Carnot heat engine receives 870600J of heat per cycle from a high- (4) temperature heat reservoir at 7600C and rejects heat to a lowtemperature heat reservoir at 60C. Determine the following. i) The thermal efficiency of this Carnot engine. ii) The amount of heat rejected to the low-temperature heat reservoir. (5) (5) 1.3 A cyclic heat engine operates between a source temperature of 800C and a sink temperature of 30C. Determine the least rate of heat rejection per kW net output of the engine. 1.4 Calculate the change in entropy when 200g of H2O at 100C is mixed with 300g of H2O at 20C in an insulated vessel. Given: Cp,m=75.5kJ/mol