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D G = D H -T D S

D G = D H -T D S. Gibbs energy change or the “free energy change”. When is D G < 0?. D H o D S o D G o Spontaneous? - + - always + - + never - - + or - at lower T + + + or - at higher T. • ΔG < 0 : Exogonic and spontaneous

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D G = D H -T D S

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  1. DG= DH-TDS Gibbs energy change or the “free energy change”

  2. When is DG < 0? DHoDSoDGo Spontaneous? - + - always + - + never - - + or - at lower T + + + or - at higher T

  3. • ΔG < 0 : Exogonic and spontaneous • ΔG > 0 : Endogonic and non-spontaneous. • ΔG= 0 : At equilibrium (No net change because rate for forward and reverse reactions are equal) Living organisms try to avoid equilibrium Why?? How??

  4. Equilibrium and Biology

  5. ΔG = ΔGo + R T ln Q But at equilibrium ΔG = 0 so DGo = - R T ln Keq

  6. http://www.iubmb-nicholson.org/swf/glycolysis.swf

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