Chapter 15, Problem 51E

a.

Interpretation Introduction

Interpretation: The concentration of $\text{HI}$ needs to be calculated at 25 minutes after start of reaction.

Concept Introduction: The integrated rate law for zero order reaction is:

  ${\text{[A] = -kt + [A]}}_{\text{o}}$

Where ${\text{[A]}}_{\text{o}}$ is initial concentration, t is time and k is rate constant.

b.

Interpretation Introduction

Interpretation: The time taken by $\text{HI}$ to decompose all of the $\text{0}\text{.25 M HI}$ needs to be calculated.

Concept Introduction: An expression used to give the relationship between the rate of reaction and the change in concentrations of the reactants raised to some power (which are experimentally determined) with respect to time is known as rate law.