Final answer:
To calculate the equilibrium constant (Keq) for the reaction I₂ (g) + H₂ (g) → 2HI (g), the equilibrium concentrations of the reactants and product are necessary. The equilibrium expression is Keq = [HI]^2 / ([H₂][I₂]), and specific equilibrium concentrations along with Keq allow for the calculation of missing concentrations.
Step-by-step explanation:
The student is asking about the calculation of the equilibrium constant (Keq) for the reaction I₂ (g) + H₂ (g) → 2HI (g) using the provided concentrations of the reactants and product. However, without the actual values of the equilibrium concentrations or the equilibrium constant, we cannot calculate Keq for the given concentrations. Instead, we can illustrate how to calculate Keq with given equilibrium concentrations using the following example:
The equilibrium expression for this reaction is:
Keq = [HI]^2 / ([H₂][I₂])
If we were given that at equilibrium, [HI] is 0.75 M, [H₂] is 0.20 M, and the Keq is 0.40, we could find the equilibrium concentration of I₂ as follows:
0.40 = (0.75^2) / (0.20 × [I₂])
By solving this equation, we could find the equilibrium concentration of I₂. Note that [HI] is squared because of the coefficient 2 in the balanced chemical equation.