If Cv=4.96cal/mol.K then increase in internal energy when temperature of 2 moles of this gas is increased from 340K to 342K
A
27.80cal
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B
19.84cal
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C
13.90cal
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D
9.92cal
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Solution
The correct option is B19.84cal Change in internal energy is equal to heat supplied at constant volume i.e , △U=qv=nCv△T n=2 T2=342K T1=340K Cv=4.96cal/mol.K =2×4.96×(342−340)=19.84cal