Question

​Identify the true statement(s) about the interpretation of free energy. 1. In principle, if a reaction is carried out to obtain the maximum useful work, entropy is high. 2. In principle, if a reaction is carried out to obtain the maximum useful work, no entropy is produced. 3. The maximum useful work for a spontaneous reaction is ΔG.

a.

1 only​

b.

2 only​

c.

1 and 3​

d.

3 only​

e.

2 and 3​

Answer 1

e. 2 and 3​is correct option.

Explanation- When a spontaneous precipitation reaction occurs, the free energy of the system decreases and the entropy is produced, but no useful work is obtained, so statement 1 is not true

Statement2. In principle, if a reaction is carried out to obtain the maximum useful work, no entropy is produce is true.

Statement3. The maximum useful work for a spontaneous reaction is ΔG is true

–ΔG corresponds to the maximum possible quantity of useful work, but when the process occurs reversibly at constant temperature and pressure, the Gibbs energy is the maximum useful work that a system can do on the surroundings . W(max)=ΔG