Q: 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

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Ans: (c)