Problem: Using data from Appendix C in the textbook, write the equilibrium-constant expression and calculate the value of the equilibrium constant and the free-energy change for these reactions at 298 K .NaHCO3(s)  ⇌  NaOH(s) + CO2(g)What is the free-energy change for this reaction at 298 K?

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NaHCO3(s)  ⇌  NaOH(s) + CO2(g)


*solids are included in the K expression 

*since gas is given we will use Kp and pressure


K=productsreactantsKp=PCO2




We can use the following equation to solve for ΔG˚rxn:


ΔG°rxn=ΔG°f, prod-ΔG°f, react


The values for ΔG˚f can be looked up in textbooks or online:

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Problem Details

Using data from Appendix C in the textbook, write the equilibrium-constant expression and calculate the value of the equilibrium constant and the free-energy change for these reactions at 298 K .

NaHCO3(s)  ⇌  NaOH(s) + CO2(g)

What is the free-energy change for this reaction at 298 K?


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Based on our data, we think this problem is relevant for Professor Liwosz's class at UB.