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An engine operates by taking an unknown number of moles of a diatomic ideal gas through the cycle shown in the figure. At point a the temperature of the gas is known to be T_o.

1216_An engine operates by taking an unknown number of moles.png

a) How many moles of gas is the engine using?

b) What is the temperature of the gas in states b and c?

c) Calculate the total work W, change in internal energy delta U, and heat Q for one full cycle (notice that process ab is not a ''standard'' process).

d) What are the work, heat, and change in internal energy for processes bc and ca?

e) What are the work, heat, and change in internal energy for process ab?

f) What is the efficiency of the engine?

g) What is the total change in entropy of the system for one cycle?

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