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  • Unit mass of a liquid with volume , is completely changed into a gas of volume  at a constant external pressure 

Unit mass of a liquid with volume V_1, is completely changed into a gas of volume  at a constant external pressure P and temperature T. If the latent heat of evaporation is , then the increase in the internal energy of the system is -

Option: 1

zero


Option: 2

P\left(V_2-V_1\right)


Option: 3

L-P\left(V_2-V_1\right)


Option: 4

\mathrm{L}


Answers (1)

best_answer

\begin{aligned} \Delta Q&=\Delta U+P \Delta V \\ \Rightarrow m L&=\Delta U+P\left(V_2-V_1\right) \\ \Rightarrow \Delta U&=L-P\left(V_2-V_1\right)\\ \quad \therefore m&=1 \end{aligned}

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Rishabh

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