A sample of 0.1 g of water at 
and normal pressure ( 
) requires 54 cal of heat energy to convert to steam at 
. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample is [NEET 2018]
Text Solution
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According to the question,
Heat spent during the conversion of sample of water at 
to steam is,
Normal pressure,
Net work done during the conversion would be given as
Here, 
Now, by the first law of thermodynamics,
where, 
is the change in internal energy of the sample.
Substituting the values in the above equation, we get
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