Unit mass of a liquid with volume 
is completely changed into a gas of volume 
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
C
D
L
Text Solution
Verified by ExpertsThe correct answer is:
C
⇒ ⇒ mL = Δ Δ U + P (V 2 – V 1 )
⇒ ⇒ Δ Δ U = L – P (V 2 – V 1 ) ( 
m = 1)
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