Q. What is the internal energy change of a system when it absorb 15 KJ of heat and does 5 KJ of work?

A
10 KJ
B
20 KJ
C
0 KJ
D
5 KJ
Solution:

Internal energy change =Heat absorbed – Work done.

Heat absorbed = 15 KJ and Work done = 5 KJ

So, Change = 15 -5 = 10 KJ

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