A gas is at one atmospheric pressure with a volume 800 cm3 When 100 J of heat is supplied to the gas , it expands to 1 litre at constant pressure. The change in its internal energy is

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80 J

- 80 J

20 J

- 20 J

answer is A.

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Detailed Solution

Ps=105N/m2W=PaV2−V1=105[1000−800]×10−8J=20JBy first law of thermodynamics,ΔU=Q−W=(100−20)J=80J

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