Chapter 12, Problem 47QRT

Interpretation Introduction

Interpretation:

Among the given reactions the reactants-favoured reactions has to be identified.

Concept Introduction:

Equilibrium constant: At equilibrium the ratio of products to reactants (each raised to the power corresponding to its stoichiometric coefficient) has a constant value, K

For a general reaction,

  $\text{aA+bB}\rightleftarrows \text{cC+dD}$

  $\text{Equilibrium}\text{constant}\text{K}\text{=}\frac{{\left[\text{C}\right]}^{\text{c}}{\left[\text{D}\right]}^{\text{d}}}{{\left[\text{A}\right]}^{\text{a}}{\left[\text{B}\right]}^{\text{b}}}$

Equilibrium Constant & Direction of reaction:

Case 1: ${\text{K}}_{\text{c}}\gg \text{1}$:

Reaction is strongly product-favoured; equilibrium concentrations of products are much greater than equilibrium concentrations of reactants.

Case 2: ${\text{K}}_{\text{c}}\ll \text{1}$:

Reaction is strongly reactant-favoured; equilibrium concentrations of reactants are much greater than equilibrium concentrations of products.

Case 3: ${\text{K}}_{\text{c}}\cong \text{1}$:

Equilibrium mixture contains significant concentrations of reactants and products; calculations are needed to determine equilibrium concentrations.