Chapter 15, Problem 15.73SP

Interpretation Introduction

Interpretation:

Concentration of SO₃ in an equilibrium mixture in which $\left[{\text{SO}}_2\right]=1.5\times {10}^{-3}\text{ M and }\left[{\text{O}}_2\right]=3.0\times {10}^{-3}\text{ M}$ at 800 K should be calculated.

Concept introduction:

The equilibrium constant, $K_c$ is the ratio between product of the equilibrium concentrations of the products and the product of equilibrium concentrations of all reactants. All the concentrations are raised to the power of its coefficient in the balanced equation. Equilibrium constant for a particular reaction is always same at a particular temperature.

Equilibrium constant expression is written as follows:

$\begin{array}{l}\text{aA + bB }\rightleftharpoons \text{ cC + dD}\\ K_c=\frac{{\left[C\right]}^c{\left[D\right]}^d}{{\left[A\right]}^a{\left[B\right]}^b}\end{array}$