Equilibrium Constants and Gibbs Free Energy

The video tutorial explains the equilibrium constant and standard free energy change. It begins with an introduction to Gibbs free energy at equilibrium, followed by a discussion on chemical reactions and stoichiometry. The concept of chemical potential and fugacity is explored, leading to the relationship between activity and equilibrium constant. The tutorial concludes with key equations and concepts, emphasizing the dependence of Gibbs free energy on temperature, standard state, and stoichiometry.

What is the Gibbs free energy change at equilibrium?

• It is undefined.

• It is zero.

• It is negative.

• It is positive.

In a chemical reaction, what do the stoichiometric coefficients represent?

• The temperature of the reaction

• The number of moles of each component

• The pressure of the reaction

• The speed of the reaction

How is the chemical potential of a component expressed in terms of fugacity?

• μi = RT ln(fi) + C

• μi = RT ln(Vi)

• μi = RT ln(Pi)

• μi = RT ln(Ti)

What does the term 'activity' in chemical potential equations refer to?

• The volume of a component

• The activity coefficient of a component

• The pressure of a component

• The concentration of a component

What is the role of the integral constant 'C' in the chemical potential equation?

• It modifies the stoichiometric coefficients.

• It accounts for pressure variations.

• It is a constant of integration.

• It adjusts for temperature changes.

Which equation represents the standard state chemical potential?

• μi = RT ln(fi) + C

• μi° = RT ln(Pi°) + C

• μi° = RT ln(fi°) + C

• μi = RT ln(Pi) + C

What is the relationship between equilibrium constant and Gibbs free energy?

• ΔG = -RT ln(K)

• ΔG° = -RT ln(K)

• ΔG° = RT ln(K)

• ΔG = RT ln(K)

Which of the following is NOT a factor affecting delta G?

• Standard state of each component

• Temperature

• Color of the reactants

• Number of moles in the reaction

What is the significance of the equilibrium constant in a chemical reaction?

• It determines the speed of the reaction.

• It measures the pressure of the reaction.

• It indicates the direction of the reaction.

• It relates to the standard Gibbs free energy.

How can the equilibrium constant be expressed in terms of activities?

• As a ratio of product activities to reactant activities

• As a product of activities of reactants

• As a difference between product and reactant activities

• As a sum of activities of reactants