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In a thermodynamic process , pressure of...

In a thermodynamic process , pressure of a fixed mass of a gas is changed in such a manner that the gas releases `20J` of heat and `8J` of work is done on the gas. If the initial internal energy of the gas was `30J`. The final internal energy will be

A

`18 J`

B

`9 J`

C

`4.5 J`

D

`36 J`

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