Sample Problem 20.4
SOLUTION:
Calculating DGo from enthalpy and entropy values
+7
-1
+5
Use DHof and So values to calculate DGosys (DGorxn) at 25 oC for this reaction.
DHorxn = S mDHof (roducts) - S nDHof (reactants)
DHorxn = [(3 mol)(-432.8 kJ/mol) + (1 mol)(-436.7 kJ/mol)] - [(4 mol)(-397.7 kJ/mol)]
DHorxn = -144 kJ
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