Answer: Molar concentration.
- A Moles under most conditions encountered
- B Pressure as frequently observed in practice
- C Molar concentration
- D Temperature in many documented cases
Correct answer: C. Molar concentration
Explanation: Kc uses molar concentrations of products and reactants raised to their stoichiometric powers.
As the reaction proceeds, reactant concentration falls and product concentration rises until both level off at equilibrium.
Concept context
When forward and reverse reaction rates are equal, equilibrium is reached. Learn about Kc, Kp, Le Chatelier's principle, and acid-base equilibria, including pH, buffer solutions, and solubility product.