19. Chemical Thermodynamics
Entropy Calculations
19. Chemical Thermodynamics Entropy Calculations
52PRACTICE 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