when a system is taken through the process abc shown in the fig. 80 J of heat is absorbed by the system and 30 J of work is done by it. If the system does 10 J work during the process adc, how much heat flows into it during the process ?

Explanation

`DeltaQ=DeltaU+DeltaW`
`In abc In abc,`
`DeltaQ =80 J,DeltaW=30J`
`So, `DeltaU=(80-30)J=50J`
`Now in abc,`
`DeltaW=10J`
`So, `DeltaQ=10J+50J=60J`
`[:.DeltaU=50 J]