When a system is taken from state A to state B along the path ACB, 80 k cal of heat flows into the system and 30 k cal of work is done. How much heat flows into the system along path ADB if the work done is 10 k cal ? When the system is returned from B to A along the curved path the work done is 20 k cal. Does the system absorb or liberate heat.

When a system is taken from state A to state B along the path ACB, 80

1.	When a system is taken from state A to state B along the path ACB, 80 k cal of heat flows into the system and 30 k cal of work is done. How much heat flows into the system along path ADB if the work done is 10 k cal ? When the system is returned from B to A along the curved path the work done is 20 k cal. Does the system absorb or liberate heat.
Answer» Solution :`dw_(BA)=-20 K cal ` `du_(BA)=-du_(ADB)` `du_(BA)=-du_(ADB)` `dQ_(BA)=du_(BA)+dw_(BA)` `=-50-20 = -70 ` k cal