Question

For the system, H2(g) + I2(g) ≡ 2 HI(g), Kc = 24.4 at 300 K. A system was charged with 1.00 mole of H2 and 1.00 mole of I2 in a 3.00 liter container. The system was allowed to come to equilibrium. What is the concentration of H2 at equilibrium?a.0.056 mol/Lb.0.042 mol/Lc.0.088 mol/Ld.0.037 mol/Le.0.004 mol/L

Answer 1

Chemistry => Equilibrium => Equilibrium Constant (Kc)

Equilibrium reactions are those in which the rate of product formation is equal to that of the reactants, therefore the reaction does not proceed and equilibrium concentrations of reactants and products are obtained.

For the overall reaction:

aA + bB ---> cC

The equilibrium equation will be:

`Kc=(\left[C\right]^c)/(\left[A\right]^a\left[B\right]^b)`

where,

Kc is the equilibrium constant

[A], [B], [C] are the molar concentration of the compounds

a, b, c are the stoichiometry coefficients

For the reaction between H2 and I2, we have the balanced equation. So, the equilibrium constant will be:

`Kc=(\left[HI\right]^2)/(\left[H_2\right]^1\left[I_2\right]^1)`