Problem: Calculate the standard free-energy change for the following reaction at 25 °C. 2 Au3+(aq) + 3 Cr(s) ↔ 2 Au(s) + 3Cr2+(aq)

FREE Expert Solution

We’re being asked to calculate for ΔG° for the given non-aqueous cell reaction .


ΔG° can be calculated from the cell potential using the following equation:

G=-nFE°cell

ΔG° = Gibbs Free Energy, J
n = # of e- transferred
F = Faraday’s constant = 96485 J/(mol e-)
cell = standard cell potential, V


First, let’s determine how many electrons were transferred from the cell reaction:


82% (122 ratings)
View Complete Written Solution
Problem Details

Calculate the standard free-energy change for the following reaction at 25 °C. 

2 Au3+(aq) + 3 Cr(s) ↔ 2 Au(s) + 3Cr2+(aq)

Frequently Asked Questions

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 Cell Potential concept. If you need more Cell Potential practice, you can also practice Cell Potential practice problems.