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Q.

How much the change in internal energy of the gas during the transition of one mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure,is :

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a

−20kJ

b

20 J

c

−12kJ

d

20 kJ

answer is A.

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Detailed Solution

ΔU=nCVΔT& T=PVnRSo, ΔT=T2−T1=P2V2−P1V1nRSo,ΔU=nRγ−1P2V2−P1V1nR=P2V2−P1V1γ−1⇒ΔU=−8×1032/5=−20kJ
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