One mole of an ideal monoatomic gas is heated at a constant pressure of one atmosphere from 0∘ to 100∘C then the change in the internal energy is
A
6.56joules
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B
8.32×102joules
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C
12.48×102joules
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D
20.80joules
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Solution
The correct option is C12.48×102joules Change in internal energy is always equal to the heat supplied at constant volume i.e. △U=(q)v=nCv△T △T=373−273=100K for monoatomic gas Cv=32R △U=n(32R)△T=1×32×8.31×100=12.48×102J