Ethylene at 30 bar and 100°C passes through a heaterexpander and emerges at 20 bar and 150°C. There is no flow of work into or out of the heater-expander, but heat is supplied. Assuming that ethylene obeys the Peng-Robinson equation of state, compute the flow of heat into the heater-expander per mole of ethylene

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30 bar 100°C Q 20 bar 150°C