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When volume changes from V to 2V at constant pressure then the change in internal enrgy will be?

I have used the equation ΔU= nC

__1. Homework Statement__When volume changes from V to 2V at constant pressure then the change in internal enrgy will be?

__2. Homework Equations__**ΔU= nC**_{v}ΔT

__3. The Attempt at a Solution__I have used the equation ΔU= nC

_{v}ΔT but the answer is PV/γ-1