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Q.

When 20 J of work was done on a gas, 40J of  heat energy was released. If the initial internal energy of the gas was 70J, what is the final internal energy?

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a

50 J

b

110 J

c

90 J

d

60 J

answer is A.

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Detailed Solution

−dW=20J;−dQ=40J;dUi=70JUf−Ui=dQ−dW⇒Uf−70=−40+20Uf=−20+70⇒Uf=50J

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