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A gas undergoes on a change of state dur...

A gas undergoes on a change of state during which 100 J of heat is supplied to it and it does 20 J of work. The system is brought back to its original state through a process during which 20 J of heat is released by the gas. What is the work done by the gas in the second process ?

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In a cyclic process `Delta U=0`
`:. Delta Q=Delta W`
`(100-20)=20+W_(2) :. W_(2) =+60J`
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