One mole of helium is adiabatically expanded from its initial state (Pi,Vi,Ti) to its final state (Pf,Vf,Tf). The decrease in the internal energy associated with this expansion is equal to

(1) CV(TiTf)

(2) CP(TiTf)

(3) 12(CP+CV)(TiTf)

(4) (CPCV)(TiTf)

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