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chap19_entropy&Gibbs

8kjmol s2482j molk o2 hf s2052jmolk so2go2gso3g so3

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Unformatted text preview: Hsys>0) and less order (∆ Ssys>0) • Temperature dependent – More favorable at higher temperatures NH4Cl(s) ⇒ NH3(g) + HCl(g) 25 Gibbs Free Energy • Measures spontaneity of ∆Suniv = ∆Ssurr + ∆Ssys a process with evaluation of only the system ∆Suniv = ( No longer needs evaluation – No longer needs evaluation of surrounding • “Free energy” =“available -T∆Suniv energy” to do work – Sum of energies available from dispersal of energy and matter -∆H sys ) + ∆Ssys T = ∆H sys - T∆Ssys ∆G sys = -T∆Suniv ∴∆G sys = ∆H sys - T∆Ssys 26 G ∀⇓ G (∆ G<0) = spontaneous process (∆ S>0) ∀⇑ G (∆ G>0) = non­spontaneous process (∆ S<0) 27 The effect of ∆ H, ∆ S, & T on ∆G • Type I – Exothermic (­∆ H) – Entropy > 0 (+∆ S) – ­∆ G • Spontaneous at all temps 2N2O(g) ⇒ 2N2(g...
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