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Question

To raise the temperature of 1 mole of a diatomic gas by 1 C at constant pressure, the required amount of heat is 120 cal.
The amount of heat which goes as the internal energy is almost equal to:

A
82.5 cal
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B
80.2 cal
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C
85.7 cal
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D
58.8 cal
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Solution

The correct option is C 85.7 cal
Given, to raise the temperature of 1 mole of a diatomic gas by 1 C at constant pressure, the required amount of heat is 120 cal
So heact capacity at constant pressure CP=120 cal
For a diatomic gas, CPCV=72R52R=75.
CV=57×120
Again,change in internal energy, ΔU=nCvdT=57×120×1=85.71 cal

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