Write an expression for the equilibrium constant of each...

Write an expression for the equilibrium constant of each chemical equation. $$\begin{array}{l}{\text { a. } \operatorname{SbCl}_{5}(g) \rightleftharpoons \operatorname{SbCl}_{3}(g)+\mathrm{Cl}_{2}(g)} \\ {\text { b. } 2 \mathrm{BrNO}(g) \rightleftharpoons 2 \mathrm{NO}(g)+\mathrm{Br}_{2}(g)} \\ {\text { c. } \mathrm{CH}_{4}(g)+2 \mathrm{H}_{2} \mathrm{S}(g) \rightleftharpoons \mathrm{CS}_{2}(g)+4 \mathrm{H}_{2}(g)} \\ {\text { d. } 2 \mathrm{CO}(g)+\mathrm{O}_{2}(g) \rightleftharpoons 2 \mathrm{CO}_{2}(g)}\end{array}$$

Write an expression for the equilibrium constant of each chemical equation.
$$\begin{array}{l}{\text { a. } \operatorname{SbCl}_{5}(g) \rightleftharpoons \operatorname{SbCl}_{3}(g)+\mathrm{Cl}_{2}(g)} \\ {\text { b. } 2 \mathrm{BrNO}(g) \rightleftharpoons 2 \mathrm{NO}(g)+\mathrm{Br}_{2}(g)} \\ {\text { c. } \mathrm{CH}_{4}(g)+2 \mathrm{H}_{2} \mathrm{S}(g) \rightleftharpoons \mathrm{CS}_{2}(g)+4 \mathrm{H}_{2}(g)} \\ {\text { d. } 2 \mathrm{CO}(g)+\mathrm{O}_{2}(g) \rightleftharpoons 2 \mathrm{CO}_{2}(g)}\end{array}$$

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Key Concepts

Stoichiometric Coefficients

Stoichiometric coefficients are the numbers in front of chemical species in a balanced chemical equation. They indicate the proportions in which reactants combine and products form. In equilibrium expressions, these coefficients serve as the exponents to which the concentrations or pressures of the respective species are raised, thus affecting the overall equilibrium constant.

Law of Mass Action

The law of mass action states that for any reversible chemical reaction, at equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction. This principle is used to derive the equilibrium constant expression, where each species appears raised to the power of its stoichiometric coefficient, reflecting its proportional role in the reaction.

Equilibrium Constant

The equilibrium constant is a value that expresses the ratio between the concentrations (or pressures) of the products and reactants for a reversible reaction at equilibrium. It is determined by the reaction conditions and temperature, providing insight into the extent to which a reaction proceeds towards the products or remains with the reactants.

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