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Q.

Unit mass of a liquid with volume V1 is completely changed into a gas of volume V2 at a constant external pressure ρ at temperature T. If the latent heat of evaporation is L, then the increase in the internal energy of the system is

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a

zero

b

L

c

L−pV2−V1

d

pV2−V1

answer is C.

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Detailed Solution

First law of thermodynamics given,  ΔQ=ΔU+pΔV

⇒ mL=ΔU+pV2−V1

⇒ ΔU=L−pV2−V1   (∵m=1)

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