Chem_215_Lect_21_Color - PS 6 Due Today; PS7 Assigned. 1...

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1 PS 6 Due Today; PS7 Assigned.
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2 Absolute Entropies, S o • Entropy is a state function. 3 rd Law of Thermodynamics: •S o = 0 for a pure perfect crystal at 0 K Calculate Δ S just like Δ H: Δ S = Entropy of final state– Entropy of initial state
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3 Gibbs Free Energy Change Δ G = Δ H - T Δ S •I f Δ G < 0 (negative), the process is spontaneous. •I f Δ G > 0 (positive), the process is nonspontaneous. •I f Δ G = 0 (zero), the process is at equilibrium.
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4 Dependence of Free Energy on Pressure • Recall that for a given sample of gas, S increases with V. • Since P and V are inversely related, S decreases with P (const. T • Consider the hypothetical reaction aA(g) +bB(g) cC(g) + dD(g quotient reaction the is Q where Q, ln RT Δ G P P P P ln RT Δ G Δ G o b B a A d D c C o + = + = If Δ G<0, reaction proceeds to right spontaneously If Δ G=0, reaction is at equilibrium atm) 1 ( ar b 1 P ; P P ln R S S o o o = =
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5 Dependence of Free Energy on Pressure
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Chem_215_Lect_21_Color - PS 6 Due Today; PS7 Assigned. 1...

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