Question

Write the expression for the equilibrium constant, K_c for each of the following reactions.

(i) ₂NOCl(g)⇌ ₂NO(g)+Cl₂(g)
(ii) 2Cu(NO₃)₂(s)⇌2CuO(s)+4NO₂(g)+O₂(g)
(iii) CH₃COOC₂H₅(aq)+H₂O(1)⇌CH₃COOH(aq)+C₂H₅OH(aq)
(iv) Fe3+(aq)+3OH−(aq)⇌Fe(OH)₃(s)
(v) I₂(s)+5F₂⇌2IF₅

Answer 1

The equilibrium constant expressions (Kc) for each reaction depend on the concentration of the products divided by the concentration of the reactants, with each raised to their stoichiometric coefficients and excluding the concentrations of any solids.

Step-by-step explanation:

To write the expression for the equilibrium constant (Kc) for each given reaction, the general formula is the concentration of the products raised to their stoichiometric coefficients divided by the concentration of the reactants raised to their stoichiometric coefficients, where only gases and aqueous solutions are included.

For the given reactions:

1. ₂NOCl(g) ⇌ ₂NO(g) + Cl₂(g): Kc = [NO]2[Cl₂] / [NOCl]2
2. 2Cu(NO₃)₂(s) ⇌ 2CuO(s) + 4NO₂(g) + O₂(g): Kc = [NO₂]4[O₂] / (Solids are not included in the Kc expression.)
3. CH₃COOC₂H₅(aq) + H₂O(l) ⇌ CH₃COOH(aq) + C₂H₅OH(aq): Kc = [CH₃COOH][C₂H₅OH] / [CH₃COOC₂H₅]
4. Fe3+(aq) + 3OH−(aq) ⇌ Fe(OH)₃(s): Kc = 1 / [Fe3+][OH−]3 (Solids are not included in the Kc expression.)
5. I₂(s) + 5F₂ ⇌ 2IF₅: Kc = [IF₅]2 / [F₂]5 (Solids are not included in the Kc expression.)