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Total differential of a state function: Internal energy for U = U ( P , V )

Total differential of a state function: Internal energy for U = U ( P , V ). (SW: appendix A). Closed system =>. T follows from the equationof state. Total differential of a state function: Internal energy for U = U ( P , V ). Closed system =>. T follows from the equationof state.

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Total differential of a state function: Internal energy for U = U ( P , V )

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  1. Total differential of a state function: Internal energy for U=U(P,V) (SW: appendix A) Closed system => T follows from the equationof state

  2. Total differential of a state function: Internal energy for U=U(P,V) Closed system => T follows from the equationof state dP is not the most convenient variable for dU

  3. Total differential of a state function: Internal energy for U=U(S,V) Closed system => T follows from the equationof state But dS is for many processes not easy to control

  4. Introduce Helmholtz free energy and Gibbs free energy (SW: page 11-12) Helmholtz free energy A Gibbs free energy G

  5. Total differential of a state function: Gibbs free energy Closed system => V follows from the equationof state Process: (P1,V1,T1,n1) =>(P2,V2,T2,n1)

  6. Total differential of a state function: Gibbs free energy Closed system => V follows from the equationof state

  7. Total differential of a state function: Gibbs free energy Closed system => V follows from the equationof state

  8. Total differential of a state function: Gibbs free energy

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