Use the standard free energies of formation to calculate ? G ? at 25 ?C for each

Question

Use the standard free energies of formation to calculate ?G? at 25 ?C for each of the following reactions.

Part A -   2SO2(g)+O2(g)?2SO3(g)

?G?f[SO2(g)]= ?300.2 kJ/mol, ?G?f[SO3(g)]= ?371.1 kJ/mol, ?G?f[O2(g)]= 0 kJ/mol.

Express your answer to one decimal place and include the appropriate units.

?G? =

N2(g)+2H2(g)?N2H4(g)

?G?f[N2H4(g)]= 159.3 kJ/mol, ?G?f[N2(g)]= 0 kJ/mol, ?G?f[O2(g)]=0 kJ/mol.

Express your answer to one decimal place and include the appropriate units

?G? =

2CH3OH(g)+O2(g)?2HCHO(g)+2H2O(g)

?G?f[CH3OH(g)]= ?162.3 kJ/mol, ?G?f[HCHO(g)]= ?102.5 kJ/mol, ?G?f[H2O(g)]= ?228.6 kJ/mol, ?G?f[O2(g)]= 0 kJ/mol.

Express your answer to one decimal place and include the appropriate units.

?G? =

Explanation / Answer

2SO2(g)+O2(g)?2SO3(g)

dG rxn = dG products - dG reactants

dG rxn = 2(-371.1) - (2*(-300.2) - 0)

dG rxn = -141.8 kJ/mol

N2(g)+2H2(g)?N2H4(g)

dG rxn = dG products - dG reactants

dG rxn = 159.3 - (0 + 2*0)

dG rxn = 159.3 kJ/mol

2CH3OH(g)+O2(g)?2HCHO(g)+2H2O(g)

dG rxn = dG products - dG reactants

dG rxn = (2(-102.5)+2(-228.6)) - (2(-162.3)+0)

dG rxn = -337.6 kJ/mol

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