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)

The blue check mark means that this solution has been answered and checked by an expert. This guarantees that the final answer is accurate.
Learn more on how we answer questions.