Entropy changes and Gibbs free energy
0/7
Intros
0/3
Examples
Lessons
- Use the Gibbs free energy equation to predict the required temperature for a reaction to be feasible.
A chemical reaction is known to have = +14 kJ mol-1 and = +44.5 J K-1 mol-1. At what temperature (K) does this reaction become feasible? - Calculate the entropy changes of the system and surroundings for a reaction.
- A chemical reaction at 298K between compounds A and B to produce C and D is described below:
2A (s) + B (aq) → C (g) + D (aq)
Molar entropy data for the substances is below:
Substance
Standard molar entropy om (J K-1 mol-1)
A (s)
43.9
B (aq)
113.2
C (g)
209.7
D (aq)
106.4
Use this data to calculate the entropy change () for the reaction - This reaction is exothermic, with a value of -75.2 kJ mol-1. What is the entropy change of the surroundings?
Use this information and the Gibbs free energy equation to explain the general feasibility of this reaction.
- A chemical reaction at 298K between compounds A and B to produce C and D is described below: