One mole of an ideal monoatomic gas is heated at a constant pressure of one atmosphere from 0∘C to 100∘ C. Then the change in the internal energy is
Change in internal energy is always equals to the heat supplied at constant volume.
i.e △U=(△Q)V=μCV△T.
For monoatomic gas CV=32R
⇒△U=μ(32R)△T=1×32×8.31×(100−0)
=12.48×102J