Assume that in the analysis of another equilibrium mixture of the same reaction as above, at the same temperature of 448°C, the equilibrium concentrations of I2 and H2 are both 0.50 mol/L. What is the equilibrium concentrations of HI?

Answer 1

In order to determine the equilibrium concentration of HI, we need to use the balanced chemical equation and the equilibrium expression for the reaction:

2HI ⇌ H2 + I2

The equilibrium constant expression for this reaction is:

Kc = [H2][I2] / [HI]²

Since we are given the equilibrium concentrations of I2 and H2 as both 0.50 mol/L, we can substitute these values into the equilibrium constant expression:

Kc = (0.50)(0.50) / [HI]²

Since the equilibrium constant is a constant for a particular reaction at a given temperature, we can rearrange the equation to solve for [HI]:

[HI]² = (0.50)(0.50) / Kc

[HI]² = 0.25 / Kc

Taking the square root of both sides:

[HI] = √(0.25 / Kc)

Without knowing the specific value of the equilibrium constant Kc, we cannot determine the exact equilibrium concentration of HI.