Thermodynamics Question 227

Question: Unit mass of a liquid with volume V1 is completely changed into a gas of volume K, 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

Options:

A) Zero

B) P(V2−V1)

C) L−P(V2−V1)

D) L

Show Answer

Answer:

Correct Answer: C

Solution:

[c] Q=mL=1×L=L;W=P(V1−V2)

Now Q=ΔU+W

or L=ΔU+P(V2−V1)

∴ΔU=L−P(V2−V1)

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