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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

(11)

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