Chemical EquilibriumMedium
Question
In which of the following equilibria, $K_{p}$ and $K_{c}$ are NOT equal?
Options
A.$\ {CO}_{(g)} + H_{2}O_{(g)} \rightleftharpoons {CO}_{2(\text{ }g)} + H_{2(\text{ }g)}$
B.$2{BrCl}_{(g)} \rightleftharpoons {Br}_{2(\text{ }g)} + {Cl}_{2(\text{ }g)}$
C.${PCl}_{5(\text{ }g)} \rightleftharpoons {PCl}_{3(\text{ }g)} + {Cl}_{2(\text{ }g)}$
D.$H_{2(\text{ }g)} + I_{2(\text{ }g)} \rightleftharpoons 2{HI}_{(g)}$
Solution
Sol. [Key Concept: Relation between Kp and Kc]
$$K_{p} = K_{c}(RT)^{\Delta n_{g}} $$for $K_{p} \neq K_{c}$,
$$\Delta n_{g} \neq 0$$
$$\Delta n_{g} = n_{p} - n_{r} $$1- $\Delta n_{g} = 2 - 2 = 0$
2- $\Delta n_{g} = 2 - 2 = 0$
3- $\Delta n_{g} = 2 - 1 = 1$
4- $\Delta n_{g} = 2 - 2 = 0$
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