Considere el equilibrio Na2 O(s)+SO2(g) ⇌Na2 SO3( s). (a) Escriba una expresión de Ke q que incl

step 1 So in this problem, we are given a reaction equation of this, N -A -2O, which is a solid reactin

Considere el equilibrio Na2 O(s)+SO2(g) ⇌Na2 SO3( s). (a)...

Considere el equilibrio $\mathrm{Na}_2 \mathrm{O}(\mathrm{s})+\mathrm{SO}_2(g) \rightleftharpoons$ $\mathrm{Na}_2 \mathrm{SO}_3(\mathrm{~s})$. (a) Escriba una expresión de $K_{e q}$ que incluya todos los reactivos y productos. (b) Explique por qué normalmente se excluyen los sólidos y líquidos puros de las expresiones de constantes de equilibrio. (c) Escriba una expresión de $K_{n q}$ que excluya el sólido y el líquido puros de la expresión de equilibrio.

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Key Concepts

Equilibrium Constant Expression

The equilibrium constant (K_eq) is a mathematical expression that relates the activities of products and reactants in a reversible chemical reaction at equilibrium, each raised to the power of their stoichiometric coefficients. In heterogeneous equilibria, even if all species are written in the expression, the underlying idea remains the same: K_eq provides a ratio that is constant at a given temperature, describing how far the reaction proceeds before reaching equilibrium.

Exclusion of Pure Solids and Liquids in Equilibrium Expressions

In chemical equilibrium expressions, pure solids and liquids are normally excluded because their activities are defined as unity. This simplification is based on the fact that the concentration of a pure solid or liquid does not change significantly during the reaction, and so their effective concentration (or activity) is constant. As a result, including them would not change the numerical value of the equilibrium constant.

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