which will not appear in the equilibrium constant expression for the reaction below? h₂o(g) + c(s)⇌h₂(g) +…

Explanation:

Step1: Recall equilibrium constant rules

The equilibrium - constant expression ($K_c$) for a reaction $aA + bB\rightleftharpoons cC + dD$ is $K_c=\frac{[C]^c[D]^d}{[A]^a[B]^b}$, where $[X]$ represents the molar concentration of species $X$. Pure solids and pure liquids are not included in the equilibrium - constant expression because their concentrations are considered constant during the reaction.

Step2: Identify the state of each species in the reaction

In the reaction $H_2O(g)+C(s)\rightleftharpoons H_2(g)+CO(g)$, $H_2O$ is a gas, $C$ is a solid, $H_2$ is a gas, and $CO$ is a gas.

Answer:

B. [C]