22 DeltaGKeqLandscape

22 DeltaGKeqLandscape - Phase Changes; Equilibria ! What is...

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CHEM 112 LRSVDS Thermo part 2 1 Phase Changes; Equilibria What is the dividing line between high and low temperature? At what temperature does a process change from being spontaneous to non-spontaneous? ! G = ______ During phase changes temperature is constant. (Heat transfer is reversible q rev ) ! H is ____for melting or boiling Phase transfer ! S is ___ for melting or boiling . Disorder ___ ! G = ______ during a phase change CHEM 112 LRSVDS Thermo part 2 2 Free Energy at Equilibrium Phase Changes involve equilibria!! Ex: Calculate the boiling point of bromine. ! H o vap 31.0 (kJ/mol) ! S o vap 92.9 (J/mol-K) " S = " H T for an isothermal process
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CHEM 112 LRSVDS Thermo part 2 3 So far we have considered only standard conditions and ! H o , ! S o , ! G o . What happens under other conditions? ! G = ! G ° + R T lnQ ! G = ! G ° + 2.303 R T log 10 (Q) aA + bB cC + dD Q = ([C] c [D] d ) = REACTION QUOTIENT ([A] a [B] b ) CHEM 112 LRSVDS Thermo part 2 4 AgCl(s) " Ag + (aq) + Cl
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22 DeltaGKeqLandscape - Phase Changes; Equilibria ! What is...

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