Topic 4: Gibbs Energy, Chemical Potential and Chemical Equilibrium

Question 1

what is Helmholtz free energy

Answer 1

represents amount of useful work of a system can perform at constant volume and temperature

A = U - TS

Question 2

what is Gibbs free energy

Answer 2

represents maximum useful work a system can do at constant pressure and temperature

G =T - TS

Question 3

definition of chemical potential for PURE substance

Answer 3

the change in Gibbs energy with respect to amount, n, at constant temperature and pressure

Question 4

definition of chemical potential for a MIXTURE

Answer 4

the change in Gibbs Energy with respect to amount, n, at constant temperature and pressure, and other components remain constant

Question 5

what is the van’t Hoff equation

Answer 5

describes how equilibrium constant K changes with temperature

derived from Gibbs free energy equation

Question 6

definition of standard free energy change

Answer 6

the change in free energy for a reaction in which 1 mol of a substance in its standard state is formed from its elements in reference forms in their standard states