Lec 26 March 11 Wed

# Lec 26 March 11 Wed - 3.15 5 Free Energy(19.5 We need a new...

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3.15 This is the Gibbs Free Energy (or just free energy, Δ G sys ) Δ G sys = Δ H sys - T Δ S sys spontaneous if : Δ G sys < 0 (for non-standard conditions, P 1atm, or conc 1 M) 5. Free Energy (19.5) We need a new function that does not require that the entropy of the universe be calculated to determine spontaneity. spontaneous if : Δ S univ > 0 Δ S sys + Δ S surr > 0 Δ S sys + (- Δ H sys /T) > 0 T Δ S sys - Δ H sys >0 Δ H sys - T Δ S sys < 0 Now everything is in terms of the system… no universe. Δ G o = Δ H o - T Δ S o ( everything is at 1 atm/1 M) spontaneous if : Δ G ο sys < 0 (for standard conditions only, P = 1 atm, or conc = 1 M) OR

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3.16 A. There are two ways of calculating Δ G o under standard conditions at 298 K . i. Use Δ G o = Δ H o - T Δ S o --same equation as above only now everything is at 1 atm/1 M --need to do sums for both Δ H o and Δ S o ii. Use tabulated standard free energy of formation values ( Δ G o f ) because the table is set to standard and at 298 K:
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Lec 26 March 11 Wed - 3.15 5 Free Energy(19.5 We need a new...

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