Problem: A reaction A (aq) + B (aq) ⇌ C (aq) has a standard free-energy change of -3.21 kJ/mol at 25°C. What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40 M, and 0 M, respectively? How would your answers above change if the reaction had a standard free-energy change of +3.21 kJ/mol?                (a) There would be no change to the answers.                (b) All concentrations would be lower.                (c) All concentrations would be higher.                (d) There would be less A and B but more C.                (e) There would be more A and B but less C.

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A reaction 

A (aq) + B (aq) ⇌ C (aq) 

has a standard free-energy change of -3.21 kJ/mol at 25°C. 

What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40 M, and 0 M, respectively? 

How would your answers above change if the reaction had a standard free-energy change of +3.21 kJ/mol? 

               (a) There would be no change to the answers. 

               (b) All concentrations would be lower. 

               (c) All concentrations would be higher. 

               (d) There would be less A and B but more C. 

               (e) There would be more A and B but less C.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Gibbs Free Energy concept. You can view video lessons to learn Gibbs Free Energy. Or if you need more Gibbs Free Energy practice, you can also practice Gibbs Free Energy practice problems.

What professor is this problem relevant for?

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