4kj 2h2go2g2h2og grxn4571kj 36 3co 2g 4h 2o g

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Unformatted text preview: ) + O2(g) 28 The effect of ∆ H, ∆ S, & T on ∆G • Type IV – Endothermic (+∆ H) – Entropy < 0 (­∆ S) – +∆ G • Nonspontaneous at all temps 3O2(g) ⇒ 2O3(g) 29 The effect of ∆ H, ∆ S, & T on ∆G • Type II – – – Exothermic (­∆ H) Entropy < 0 (­∆ S) ∆ G is temp­dependent H2O(l) ⇒ H2O(s) ­∆ H Water freezing is temp­dependent ∴ Spontaneous @ low temps Non­spontaneous @ high temps 30 The effect of ∆ H, ∆ S, & T on ∆G • Type III – – – Endothermic (+∆ H) Spontaneous (+∆ S) ∆ G is temp­dependent H2O(l) ⇒ H2O(g) +∆ H Water boiling is temp­dependent ∴ Spontaneous @ high temps Nonspontaneous @ low temps 31 Calculating ∆ G°rxn • Calculate ∆ G°rxn (at 25°C) for • SO2; ∆ H°f = ­296.8 kJ/mol & ∆ S° = 248.2 J/ (mol•K) O2; ∆ H°f = ?, ∆...
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