G = U+PV-TS
Donc dG = dU + d(PV) - d(TS)
( Oui normalement il y a un moins en plus dans la formule du prof mais ça je peux pas te l'expliquer désolée..)
Comme dU = - PdV + TdS
Alors:
dG = -PdV + TdS + PdV + VdP - TdS - SdT
Donc dG = - SdT + VdP
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