Question

Unit of equilibrium constant for the reversible reaction $H_2+I_2\rightleftharpoons 2HI$ is

• A. $mo{l}^{-1}$ litre
• B. $mo{l}^{-2}$ litre
• C. mol $litr{e}^{-1}$
• D. none of these

Answer 1

Answer: (D)

none of these

The unit of Equilibrium constant depends on a number of moles of reactants and products. The equilibrium constant is unitless and has no dimensions. When the total moles of reactants and products are equal then K (Equilibrium constant) has no units. When the number of moles of reactants and products is different than the unit of the Equilibrium constant is L2 mol-2. The units of equilibrium constant depend on moles of reactants and products. Equilibrium constant has no unit.

For the given reaction as the number of reactants and products is equal to the total number of moles of the product its equilibrium constant is dimensionless. It has no unit.