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A::B::CSolution :

(a) `Q=nC_VDeltaT` <br> `200=(1)(3/2R)(T_f-300)` <br> or `200=1.5xx8.31(T_f-300)` <br> Solving we get, <br> `T_f=316K` <br> (b) `Q=nC_pDetlaT` <br> `200=(1)(5/2R)(T_f-300)` <br> or `200=2.5xx8.31(T_f-300)` <br> Solving we get, <br> `T_f=309.6K`