$A$ unit mass of a liquid with volume $V_1$ is completely changed into a gas of volume $V_2$ 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:
- AZero
- B$P(V_2 - V_1)$
- C$L - P(V_2 - V_1)$
- D$L$
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