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Entropy Calculations - Part 2 of 2
Entropy Calculations - Part 2 of 2
19. Chemical Thermodynamics / Entropy Calculations / Problem 2

Lead oxide can be reduced by carbon (graphite) to produce lead metal and carbon dioxide. Determine the temperature at which this reaction is spontaneous.

2 PbO(s) + C(s, graphite) → 2 Pb(s) + CO2(g)

                            ΔH° (kJ/mol)           S° (J/mol•K)           ΔG° (kJ/mol)
PbO(s)                   –217.3                    68.70                  –187.9
C(s. graphite)         0                           5.69                        0
Pb(s)                       0                           68.85                      0
CO2(g)                  –393.5                   213.6                    –394.4

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