The reaction 3 A(g)+B(s) ⇌2 C(a q)+D(a q) occurs at 25^∘ C in a flask, which has 1.87 L availab

step 1 Okay, so the reaction here is 3A, which is a gas, plus B, which is a solid, gives us 2C, which i

The reaction 3 A(g)+B(s) ⇌2 C(a q)+D(a q) occurs at 25^∘ C...

The reaction $3 \mathrm{~A}(g)+\mathrm{B}(s) \rightleftharpoons 2 \mathrm{C}(a q)+\mathrm{D}(a q)$ occurs at $25^{\circ} \mathrm{C}$ in a flask, which has $1.87$ L available for gas. After the reaction attains equilibrium, the amounts (mol) or concentrations $(M)$ of substances are as follows: $2.48 \mathrm{~mol} \mathrm{~A} \quad 1.13 M \mathrm{C}$ $2.41 \mathrm{~mol} \mathrm{~B} \quad 2.27 M \mathrm{D}$ What is the equilibrium constant $K_{c}$ for this reaction at $25^{\circ} \mathrm{C}$ ? a. $1.24$ b. $0.190$ c. $0.516$ d. $1.15$ e. $0.939$

The reaction $3 \mathrm{~A}(g)+\mathrm{B}(s) \rightleftharpoons 2 \mathrm{C}(a q)+\mathrm{D}(a q)$ occurs
at $25^{\circ} \mathrm{C}$ in a flask, which has $1.87$ L available for gas. After the reaction attains equilibrium, the amounts (mol) or concentrations $(M)$ of substances are as follows:
$2.48 \mathrm{~mol} \mathrm{~A} \quad 1.13 M \mathrm{C}$
$2.41 \mathrm{~mol} \mathrm{~B} \quad 2.27 M \mathrm{D}$
What is the equilibrium constant $K_{c}$ for this reaction at $25^{\circ} \mathrm{C}$ ?
a. $1.24$
b. $0.190$
c. $0.516$
d. $1.15$
e. $0.939$

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Key Concepts

Equilibrium Expression

The equilibrium expression is derived from the balanced chemical equation and involves writing the concentration of each species raised to the power of its coefficient in the reaction. This expression is used to calculate the equilibrium constant by substituting the equilibrium concentrations of the reactants and products.

Equilibrium Constant (Kc)

Kc is a measure of the extent of a chemical reaction at equilibrium, defined by the ratio of the product concentrations raised to their stoichiometric coefficients to the reactant concentrations raised to their respective stoichiometric coefficients. It provides insight into whether products or reactants are favored under a given set of conditions.

Exclusion of Pure Solids

In equilibrium constant expressions, pure solids (and pure liquids) are omitted because their activities are constant and do not change during the reaction. This simplifies the equilibrium expression to only include species in the gas and aqueous phases.

Molar Concentration

Molar concentration, expressed in moles per liter (M), is calculated by dividing the number of moles of a substance by the volume it occupies. This conversion is essential when gases or solutes' quantities are provided as moles and need to be expressed in concentration units for use in equilibrium calculations.

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