Chemistry Equilibrium PMC 2021
PMDC Verified Question 69 of 102
The equilibrium constant is always written as a ratio of:
A
Reactants over products
B
Product over reactants
C
Product times reactants
D
None of these
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Product over reactants
Concept:

By universal convention in chemistry, governed by the Law of Mass Action, the equilibrium constant compares product concentration to reactant concentration.

Formula:

$$ K = \frac{[\text{Products}]^p}{[\text{Reactants}]^r} $$

Solution:

  • The formula explicitly places the equilibrium concentrations of the products in the numerator.


  • The equilibrium concentrations of the reactants are placed in the denominator.


Why other options are incorrect:

Reactants over products is the inverse of the equilibrium constant. Multiplying them has no standard physical meaning in equilibrium.

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