Question

write the expression for the equilibrium constant for the following equation. pcl₃(g) + cl₂(g) ⇌ pcl₅(g)

Explanation:

Step1: Write the general formula for equilibrium constant

For a reaction \(aA + bB
ightleftharpoons cC + dD\), the equilibrium constant \(K=\frac{[C]^c[D]^d}{[A]^a[B]^b}\), where \([X]\) represents the molar concentration of species \(X\).

Step2: Apply the formula to the given reaction

In the reaction \(PCl_3(g)+Cl_2(g)
ightleftharpoons PCl_5(g)\), \(a = 1\) (for \(PCl_3\)), \(b=1\) (for \(Cl_2\)), \(c = 1\) (for \(PCl_5\)).
So, \(K=\frac{[PCl_5]}{[PCl_3][Cl_2]}\)

Answer:

\(K=\frac{[PCl_5]}{[PCl_3][Cl_2]}\)