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

Question

In the thermodynamical process, the pressure of a fixed mass of gas is changed in such a manner that the gas releases 20 J of heat and 8 J of work is done on the gas. If the internal energy of the gas was 30 J , then the final internal energy will be, 42 J, 18 J, 12 J, 60 J

MARKS App · Accepted Answer

As, ∆ U = ∆ Q - ∆ W ⇒ ∆ U = - 20 - - 8 = - 12 J ⇒ ∆ U = U f - U i = - 12 ∴ U f = - 12 + U i = - 12 + 30 = 18 J

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