Chapter 17, Problem 17.32P

(a)

Interpretation Introduction

Interpretation:

${\text{K}}_{\text{p}}$ for the given reaction ${\text{N}}_{\text{2}}{\text{O}}_{\text{4}}{}_{\text{(g)}}\underset{}{\rightleftharpoons }{\text{ 2NO}}_{\text{2}}{}_{\text{(g)}}$ has to be calculated.

Concept Introduction:

Relation between ${\text{K}}_{\text{p}}$ and ${\text{K}}_{\text{c}}$:

The relation between and ${\text{K}}_{\text{p}}$ and ${\text{K}}_{\text{c}}$ is given by the following equation.

  ${\text{K}}_{\text{p}}{\text{ = K}}_{\text{c}}{\text{(RT)}}^{\Delta \text{ngas}}$

Where,

${\text{K}}_{\text{p}}$ is the equilibrium constant in terms of partial pressure

${\text{K}}_{\text{c}}$ is the equilibrium constant in terms of concentration

$\Delta \text{ngas = moles of gaseous product - moles of gaseous reactant}$

Only moles of gaseous products and reactants is used to calculate $\Delta \text{ngas}$

(b)

Interpretation Introduction

Interpretation:

${\text{K}}_{\text{p}}$ for the given reaction ${\text{N}}_{\text{2}}{}_{\text{(g)}}{\text{ + 3H}}_{\text{2(g)}}\underset{}{\rightleftharpoons }{\text{ 2NH}}_3{}_{\text{(g)}}$ has to be calculated.

Concept Introduction:

Relation between ${\text{K}}_{\text{p}}$ and ${\text{K}}_{\text{c}}$:

The relation between and ${\text{K}}_{\text{p}}$ and ${\text{K}}_{\text{c}}$ is given by the following equation.

  ${\text{K}}_{\text{p}}{\text{ = K}}_{\text{c}}{\text{(RT)}}^{\Delta \text{ngas}}$

Where,

${\text{K}}_{\text{p}}$ is the equilibrium constant in terms of partial pressure

${\text{K}}_{\text{c}}$ is the equilibrium constant in terms of concentration

$\Delta \text{ngas = moles of gaseous product - moles of gaseous reactant}$

Only moles of gaseous products and reactants is used to calculate $\Delta \text{ngas}$