Determine the equilibrium concentration of H2O if the starting concentrations of both reactants are 0.004325 M, with [HOCl]o = 0.000 M.

Question

The value of K_c for the reaction between water vapor and dichlorine monoxide is 0.0900 at 25°C.

H2O (g) + Cl2O (g) --> 2HOCl (g)

Determine the equilibrium concentration of H₂O if the starting concentrations of both reactants are 0.004325  M, with [HOCl]_o = 0.000 M.

Answer 1

H2O (g) + Cl2O (g) --> 2HOCl (g)

0.004325......0.004325............0............Initial

-x.................-x....................+2x.........Change

0.004325-x.....0.004325-x......2x...........Equilibrium

K = [HOCl]² / [H2O][Cl2O]

We need to know the K for this reaction at the temperature of the reaction. Then plug in the value for Kc and the equilibrium values for the reactants and products from the ICE table. Solve for x and that will be the equilibrium concentration of H2O