Question

What will be the unit of equilibrium constant for the following reaction?
CH₃COCH₃ + HCN ⇌ CH₃C(OH)(CN)CH₃

• A. mol² dm⁻⁶
• B. No unit (unitless)
• C. mol dm⁻³
• D. mol⁻¹ dm³

Hint:

Always check the stoichiometry of the reaction while calculating the equilibrium constant. Units depend on the number of moles of reactants and products.

Answer 1

The Correct Option is D

1. The equilibrium constant (K_c) is expressed as:
   K_c = [products] / [reactants]
2. Substituting the respective units yields:
   K_c = (mol dm^-3) / ((mol dm^-3) (mol dm^-3))
3. The derived unit for K_c is:  
   K_c = mol^-1 dm³