Unit mass of a liquid with volume \( V_{1} \) is completely changed into a gas of volume \( V_{2...

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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
a. Zero
b. \( P\left(V_{2}-V_{1}\right) \)
c. \( L-P\left(V_{2}-V_{1}\right) \)
d. \( L \)
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