Question

Equal concentrations of hydrogen and iodine are mixed together in a closed container at 700 K and allowed to come to equilibrium. If the concentration of HI at equilibrium is 0.85 mol dm^-3 , what are the equilibrium concentrations of H₂ and I₂ if K_c = 54 at this temperature?

Answer 1

Given: [HI_(g)] = 0.85 mol dm^-3

K_c = 54 at 700 K

Equilibrium concentrations of H₂ and I₂

Formula: K_c = \(\frac{[C]^c [D]^d}{[A]^a [B]^b}\)

Balanced chemical reaction: 2HI_(g)

Equilibrium concentration of I_2(g)  = Equilibrium concentration of H_2(g) 

Equilibrium concentrations of H₂ and I₂ are equal to 0.12 mol dm^-3