CHM 2046C Module 13 Sample Name: _____Answers_____

Part H: Calculation of an Equilibrium Constant from ∆G^o Values

10 points

See Table 16.4 page 673; and worked example 16.9 page 673:

Methanol (CH₃OH, an important alcohol used in the manufacture of adhesives, fibers, and plastics, is synthesized industrially by the reaction:

CO (g) + 2 H₂ (g) ↔ CH₃OH (g)

Use the thermodynamic data in Appendix B (values below) to calculate the equilibrium constant for the reaction at 25^oC.

Additional Values from Appendix B:

∆G^o_f CO = 51.3 kJ/mol

∆H^o_f CO = -110.5 kJ/mol

S^o CO = 197.6 J/K∙mol

S^o H₂ = 130.6 J/K∙mol

∆G^o_f CH₃OH = -166.4 kJ/mol

∆H^o_f CH₃OH= -201.2 kJ/mol

S^o CH₃OH= 238 J/K∙mol