Sample Problem 20.6
(continued)
(b) DGorxn = DHorxn - TDSorxn
DGorxn = -198.4 kJ - [(1173 K)(-187.9 J/mol.K)(kJ/103J)]
DGorxn = +22.0 kJ; the reaction will be nonspontaneous at 900.oC
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