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Question

When a monoatomic gas expands at a constant pressure, what percentage of heat supplied is used to increase the internal energy of the gas?


Solution

For a monoatomic gas,
Cv=3R2 and Cp=5R2
So,
ΔQ=nCpΔT=n5R2ΔT
and ΔU=nCvΔT=n3R2ΔT
Percentage of heat required to increase internal energy =ΔUΔQ×100=3nRΔT25nRΔT2×100
=60%
 

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