Question

Initial number of moles of reactants taken in a closed reaction vessel are given. Percentage degree of dissociation is given. Identify the correct sequence of steps to calculate $K_c$ value.
(a) Calculation of equilibrium concentrations of reactants and products.
(b) Calculation of equilibrium number of moles.
(c) Writing equilibrium constant expression for the reaction.
(d) Calculation of $K_c$ value by using the equilibrium concentration.

• A. dbca
• B. bacd
• C. cbad
• D. badc

Answer 1

The correct option is C cbad

Relation between concentration and equilibrium constant i.e. relate given and desired result

(c) Writing equilibrium constant expression for the reaction.

Since we need concentrations at equillibrium for the calculation, equilibrium moles are calculated

(b) Calculation of equilibrium number of moles.

Concentration from moles

(a) Calculation of equilibrium concentrations of reactants and products.
Upon substitution, value of equilibrium constant
(d) Calculation of $K_c$ value by using the equilibrium concentration.

Sequence is cbda

C is correct