Using Δ[latex]G°_{f}[/latex] values from Appendix 1, calculate the standard free energy change at 25°C for the reaction referred to in Example 16.3. ANALYSIS equation for the reaction ([latex]CaSO_{4}(s) → Ca^{2+}(aq) + SO_{4}^{2-}(aq)[/latex]) Information given: Δ[latex]G°_{f}[/latex] values (Appendix 1) Information implied ΔG° Asked for STRATEGY Obtain Δ[latex]G°_{f}[/latex] values from Appendix 1 and substitute into Equation 16.3. Δ[latex]G°_{reaction}[/latex] = ∑Δ[latex]G°_{f products}[/latex] - Σ Δ[latex]G°_{f reactants}[/latex] (16.3)

ΔG° = Δ[latex]G°_{f}Ca^{2+}(aq) + ΔG°_{f} SO_{4}^{2-}(aq) - ΔG°_{f} CaSO_{4}(s)[/latex] = -553.6 kJ - 744.5 kJ + 1321.8 kJ = +23.7 kJ ΔG° END POINT Notice that the value of ΔG° at 25°C is essentially identical to that obtained in Example 16.3 , which is reassuring.

Question 16.4: Using ΔG°f values from Appendix 1, calculate the standard fr...

Chemistry: Principles and Reactions

Using Δ $G°_{f}$ values from Appendix 1, calculate the standard free energy change at 25°C for the reaction referred to in Example 16.3.

ANALYSIS
equation for the reaction ( $CaSO_{4}(s) → Ca^{2+}(aq) + SO_{4}^{2-}(aq)$ )	Information given:
Δ $G°_{f}$ values (Appendix 1)	Information implied
ΔG°	Asked for

STRATEGY

Obtain Δ $G°_{f}$ values from Appendix 1 and substitute into Equation 16.3.

Δ $G°_{reaction}$ = ∑Δ $G°_{f products}$ – Σ Δ $G°_{f reactants}$ (16.3)

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