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Date: 8-1-2017
1606
Date: 22-12-2020
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Date: 2-7-2017
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The standard Gibbs free energy change, ΔG⁰, for a reaction can be calculated from the standard free energies of formation, ΔG⁰f .
ΔG⁰f = ∑nΔG⁰f(products) – ∑mΔG⁰f(reactants)
where n and m are the coefficients in the balanced chemical equation of the reaction.
Standard free energies of formation values are listed in the appendix, “Standard Thermodynamic Quantities for Chemical Substances at 25°C.”
Example 5
Calculate the standard free energy change for the following reaction, using standard free energies of formation:
5 C(s) + 2 SO2(g) → CS2(g) + 4 CO(g)
Is this a spontaneous reaction?
Solution
ΔG⁰= ∑nΔG⁰f(products) – ∑mΔG⁰f(reactants)
ΔG⁰ = [(4 x −137.2 kJ/mol) + (67.1 kJ/mol)] – [(5 x 0 kJ/mol) + (2 x −300.1 kJ/mol)]
ΔG⁰= (-481.7 kJ/mol) – (-600.2 kJ/mol)
ΔG⁰= 118.5 kJ/mol
ΔG⁰ has a positive value so this is not a spontaneous process.
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