1.

In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas release `20 J` of heat and `8 J` of work is done on the gas. If initial internal energy of the gas was `30 J`, what will be the final internal energy?A. 58 JB. 18 JC. 42 JD. 2 J

Answer» Correct Answer - B
`dQ=-20J`
`dW=-8J` (on the gas)
`dU=dQ-dW`
`=-20+8`
=-12
`U_(r)=U_(i)+(dQ-dW)`
`=30-12`
=18 J


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