7. Unit mass of a liquid with volume
V1 is completely changed into a gas of volume V2 at a constant external pressure P and temperature T. If the latent heat of evaporation for the given mass is L, then the increase in the internal energy of the system is
(a) Zero (b) P(V2-V1)
(c) L- P(V2-V1) (d) L
Answer-c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a