Question

What is the equilibrium concentration of PCl3 , given that the equilibrium concentration of PCl5 is 0.200 mol/L ?

K eq = 0.59

Answer 1

The reaction is given by the equation: PCl5 ⇌ PCl3 + Cl2

The equilibrium constant expression is given by: K eq = ([PCl3] * [Cl2]) / [PCl5]

Let's assume that the equilibrium concentration of PCl3 is x mol/L.

Since 1 mol of PCl5 produces 1 mol of PCl3 and 1 mol of Cl2, the concentration of Cl2 at equilibrium will also be x mol/L.

Therefore, substituting the values into the equilibrium constant expression:

0.59 = (x * x) / 0.200

0.59 * 0.200 = x2

0.118 = x2

Taking the square root of both sides:

x ≈ 0.343

Therefore, the equilibrium concentration of PCl3 is approximately 0.343 mol/L.