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Chapter 1: Q17CP (page 20)

What is the free energy change for a reaction at equilibrium?

Short Answer

Expert verified

The system does not workon its surroundings, there isno net change in the system's free energy.

Step by step solution

01

Gibb’s free energy

Gibbs free energy, often known as free energy, is a thermodynamic potential that aids in the calculation of maximum reversible work in a thermodynamic system under constant pressure and temperature. The maximum amount can be reached by a method that is totally reversible.

02

Free energy change at equilibrium

Thermodynamic equilibrium is defined as a situation in which there is no net flow of energy or matterbetween or within systems. When a system is in equilibrium, macroscopic change does not occur.

When a system transitions from its initial to its final state, the work done to the environment by the system is deducted from the work done by pressure forces, resulting in a drop in the free energy of the system.

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Most popular questions from this chapter

Explain how biochemists define the standard state of a solute. Why do biochemists and chemists use different conventions?

Two biochemical reactions have the same Keq=5×108at tem-perature T1=298K. However, Reaction 1 has ΔH°=-28kJmol-1and Reaction 2 has.ΔH°=+28kJmol-1The two reactions utilize the same reactants. Your lab partner has proposed that you can get more of the reactants to proceed via Reaction 2 rather than Reaction 1 by lowering the temperature of the reaction. Will this strategy work? Why or why not? How much would the temperature have to be raised or lowered in order to change the value of K2K1from 1 to 10?

Explain why changes in both enthalpy and entropy determine the spontaneity of a process.

Consider a reaction with ΔH = 15 kJ and ΔS = 50 J · K−1 . Is the reaction spontaneous (a) at 10°C, (b) at 80°C?

For the reaction A→Bat 298 K, the change in enthalpy is-7kJmol-1and the change in entropy is -25kJmol-1. Is the reaction spontaneous? If not, should the temperature be increased or decreased to make the reaction spontaneous?
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