19. Chemical Thermodynamics
Gibbs Free Energy
19. Chemical Thermodynamics Gibbs Free Energy
69PRACTICE PROBLEM
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
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