The diagram in the figure (Figure 1) shows a cycle of a heat engine that uses 0.

Question

The diagram in the figure (Figure 1) shows a cycle of a heat engine that uses 0.250 mole of an ideal gas having The curved part of the cycle is adiabatic.

I have the answers to A, B, C, and E but I have no idea how to do parts D, F, or G

B)How much heat enters this gas per cycle? I know this is 5470J

C)Where does the entering of heat happen? This is c -> a

D)How much heat leaves this gas in a cycle? (Joules)

E)Where does the leaving of heat of this gas occur? This is b -> c

F)How much work does this engine do in a cycle? (Joules)

G)What is the thermal efficiency of the engine? (%)

Explanation / Answer

first find the work done by the engine (part F) by finding the equation area under the PV curve. then for ,part D, subtract total heat with work done to get the heat leaving the system. for part G use the efficiency formula n = (1- Ql/Qh) , wher Ql is heat leaving the system and Qh is heat entered.

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