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`3` moles of an ideal mono atomic gas performs a cycle as shown in fig. `If` gas temperature `T_(A)=400 K` `T_(B)=800K,T_(C)=2400K`, and `T_(D)=1200K`. Then total work done by gas is

Answer» `1rarr2` and `3rarr4` are isochoric processes.
Therefore, work done is zero.
`therefore W_("total")=W_(23)+W_(41)=P_(2)(V_(3)-V_(2))+P_(4)(V_(1)-V_(4))`
`=nR(T_(3)-T_(2))+nR(T_(1)-T_(4))`
`=nR(T_(3)-T_(2)+T_(1)-T_(4))=800nR=2400R`


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