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Question

One mole of an ideal monoatomic gas is heated at a constant pressure of one atmosphere from 0C to 100 C. Then the change in the internal energy is

A
6.56 joules
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B
8.32×102 joules
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C
12.48×102 joules
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D
20.80 joules
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Solution

The correct option is C 12.48×102 joules

Change in internal energy is always equals to the heat supplied at constant volume.
i.e U=(Q)V=μCVT.
For monoatomic gas CV=32R
U=μ(32R)T=1×32×8.31×(1000)
=12.48×102J


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