Chapter 17, Problem 17.8P

(a)

Interpretation Introduction

Interpretation:

For the formation reaction of $\text{HI}$, ${\text{H}}_{\text{2(g)}}{\text{ + I}}_{\text{2(g)}}\stackrel{}{\rightleftharpoons }{\text{ 2HI}}_{\text{(g)}}$, the change in Q as a function of time has to be given.

Concept Introduction:

Reaction Quotient:

Reaction quotient, Q is the ratio between product of the product concentration to the product of the reactant concentration with each term raised to the power of its balancing coefficient.

Consider a general equation,

  $a\text{A +}b\text{A}\stackrel{}{\rightleftharpoons }c\text{C}+d\text{D}$

Where a, b, c and d are the stoichiometric coefficients.  The reaction quotient is,

  ${\text{Q}}_{\text{c}}\text{ = }\frac{{\text{[C]}}^{\text{c}}{\text{[D]}}^{\text{d}}}{{[\text{A]}}^{\text{a}}{\text{[B]}}^{\text{b}}}$

(b)

Interpretation Introduction

Interpretation:

For the formation reaction of $\text{HI}$, ${\text{H}}_{\text{2(g)}}{\text{ + I}}_{\text{2(g)}}\stackrel{}{\rightleftharpoons }{\text{ 2HI}}_{\text{(g)}}$, whether the value of Q would be different, if it is plotted against ${\text{[I}}_{\text{2}}\text{]}$ instead of ${\text{[H}}_{\text{2}}\text{]}$ has to be given.

Concept Introduction:

Reaction Quotient:

Reaction quotient, Q is the ratio between product of the product concentration to the product of the reactant concentration with each term raised to the power of its balancing coefficient.

Consider a general equation,

  $a\text{A +}b\text{A}\stackrel{}{\rightleftharpoons }c\text{C}+d\text{D}$

Where a, b, c and d are the stoichiometric coefficients.  The reaction quotient is,

  ${\text{Q}}_{\text{c}}\text{ = }\frac{{\text{[C]}}^{\text{c}}{\text{[D]}}^{\text{d}}}{{[\text{A]}}^{\text{a}}{\text{[B]}}^{\text{b}}}$