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Question: In changing the state of thermodynamics from A to B state, the heat required is Q and the work done ...

In changing the state of thermodynamics from A to B state, the heat required is Q and the work done by the system is W. The change in its internal energy is

A

Q + W

B

Q – W

C

Q

D

Q−W2\frac{Q - W}{2}

Answer

Q – W

Explanation

Solution

ΔQ=ΔU+ΔW\Delta Q = \Delta U + \Delta W

⇒ ΔU=ΔQ−ΔW=Q−W\Delta U = \Delta Q - \Delta W = Q - W (using proper sign)