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When the system is retuned form state B ...

When the system is retuned form state B to A along the curved path, the work doen on the system is 20 J Does the system absorb ro liberate heat, and how much?
When a system is taken from state A to state B along the parth ACB in the figure below ,80 j of heat flows into the system and the system does 30 J of work.

A

`-70 J, ` heat is liberated

B

`-60J` , heat is liberated

C

`70 J` , heat is absorbed

D

`60 J` , heat is absorbed

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