SATHEE: Thermodynamics Question 179

Thermodynamics Question 179

Question: 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

[Roorkee 1999]

Options:

A) Zero

B) $P (V_{2} - V_{1})$

C) $L - P (V_{2} - V_{1})$

D) L

Show Answer

Answer:

Correct Answer: C

Solution:

$Δ Q = Δ V + P Δ V$

Therefore mL = DU + P(V2 - V1)

Therefore DU = L - P (V2 - V1) ( $∵$ m = 1)

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Thermodynamics Question 179

Question: Unit mass of a liquid with volume V1 is completely changed into a gas of volume V2 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:

Answer:

Solution:

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Question: 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