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Question

A perfect gas goes from state A to another state B by absorbing 8×105 J of heat and doing 6.5×105 J of external work. The change in internal energy will be

A
1450 kJ
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B
150 kJ
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C
15 kJ
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D
145 kJ
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Solution

The correct option is B 150 kJ
Using,
ΔQ=ΔU+ΔW
ΔU=ΔQΔW
=1.5×105 J=150 kJ

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