4. Energetics

Gibbs Free Energy — Quiz

Test your understanding of gibbs free energy with 5 practice questions.

Practice Questions

Question 1

In a process at constant temperature and pressure, the Gibbs free energy change $\Delta G$ represents which of the following?

Question 2

Two sequential reactions have $\Delta G_1^\circ = -30\,$kJ/mol and $\Delta G_2^\circ = +10\,$kJ/mol. What is the net standard free energy change and is the overall process spontaneous?

Question 3

A reaction has $\Delta G^\circ = -25\,$kJ/mol at $T = 310\,$K. Using the relation $\Delta G^\circ = -RT\,\ln K$, what is the equilibrium constant $K$? (R = 8.314 J/(mol·K))

Question 4

For a reaction at 298 K with $\Delta G^\circ = +10\,$kJ/mol and reaction quotient $Q = 0.10$, what is $\Delta G$? (Use $\Delta G = \Delta G^\circ + RT\,\ln Q$, $R = 8.314$ J/(mol·K))

Question 5

A reaction has $\Delta G^\circ = -15\,$kJ/mol and $\Delta H^\circ = -20\,$kJ/mol at 298 K. What is the standard entropy change $\Delta S^\circ$?