Chapter 17, Problem 17.30P

(a)

Interpretation Introduction

Interpretation:

${\text{K}}_{\text{c}}$ for the given reaction ${\text{H}}_{\text{2}}{}_{\text{(g)}}{\text{ + I}}_{\text{2(g)}}\underset{}{\rightleftharpoons }{\text{ 2HI}}_{\text{(g)}}$ 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:

${\text{K}}_{\text{c}}$ for the given reaction ${\text{2SO}}_{\text{2}}{}_{\text{(g)}}{\text{ + O}}_{\text{2}}{}_{\text{(g)}}\underset{}{\rightleftharpoons }{\text{ 2SO}}_{\text{3(g)}}$ 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 $\Delta \text{ngas}$