To raise the temperature of 1 mole of a diatomic gas by 1∘C at constant pressure, the required amount of heat is 120cal.
The amount of heat which goes as the internal energy is almost equal to:
A
82.5cal
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B
80.2cal
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C
85.7cal
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D
58.8cal
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Solution
The correct option is C85.7cal Given, to raise the temperature of 1 mole of a diatomic gas by 1∘C at constant pressure, the required amount of heat is 120cal
So heact capacity at constant pressure CP=120cal
For a diatomic gas, CPCV=72R52R=75. ⇒CV=57×120
Again,change in internal energy, ΔU=nCvdT=57×120×1=85.71cal