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of a liquid is converted to vapour at pressure. If of the heat supplied is used for increasing the volume by during this phase change, then the increase in internal energy in the process will be :
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The correct answer is:
As pressure against which expansion is happening is constant, work done can be written as
As only of heat is used in work done.
Hence
The rest goes in increase in internal energy, which is of heat.
Change in internal energy
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