Question
What is the Internal energy in the process of vapourisation?
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Answer
During vapourisation, volume increases. So work done = P(Vf - Vi) and temperature does not change. So, dQ = mLv
$\therefore$ from first law of thermodynamics, dU= dQ - DW
= mLv - P(Vf - Vi).
$\therefore$ from first law of thermodynamics, dU= dQ - DW
= mLv - P(Vf - Vi).
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