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In a thermodynamic process the pressure of a fixed mass of gas is altered in such a manner that the gas releases out 20J of heat and at same time 8J of work is done on gas. The change in internal energy of gas is

a
12 J
b
20 J
c
- 12 J
d
- 20 J

detailed solution

Correct option is C

ΔU=Q−W=[(−20)−(−8)]J=−12J

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