Equilibrium Constants and Their Definitions

The video tutorial introduces three main types of equilibrium constants: KC, KP, and the thermodynamic equilibrium constant K. KC is defined in terms of reactant and product concentrations at equilibrium, while KP is based on partial pressures, particularly useful for gas-phase reactions. The thermodynamic equilibrium constant K is defined using activities, which are unitless. The video explains how these constants are used, their dependence on temperature, and their units, providing examples such as the ammonia formation reaction.

What are the three main types of equilibrium constants introduced in the video?

• KD, KE, and KF

• KG, KH, and KI

• KA, KB, and KC

• KC, KP, and K

How is the equilibrium constant KC defined?

• In terms of partial pressures

• In terms of concentrations of reactants and products

• In terms of thermodynamic activities

• In terms of temperature

For the reaction A + B goes to C + D, how is KC expressed?

• As the ratio of concentrations of products to reactants

• As the sum of concentrations of products

• As the difference in concentrations of reactants

• As the product of concentrations of reactants

What happens to the value of KC if the temperature changes?

• It doubles

• It becomes zero

• It changes to a new value

• It remains constant

In what units are concentrations usually given for KC calculations?

• Moles per decimeter cubed

• Liters per mole

• Moles per liter

• Grams per liter

What is the equilibrium constant KP defined in terms of?

• Thermodynamic activities

• Partial pressures

• Temperature

• Concentrations

How are KP and KC related?

• They are unrelated

• KP is always greater than KC

• KP is the inverse of KC

• KP equals KC times RT raised to the power of delta n

What is the advantage of using thermodynamic activities in defining K?

• They are always constant

• They have no units

• They have units

• They are easier to measure

What is the standard pressure used in defining the activity of a gaseous reactant?

• 1 Torr

• 1 bar

• 1 Pascal

• 1 atmosphere

Which equilibrium constant is defined in terms of thermodynamic activities?

• K

• KP

• KC

• KT