Chapter 12, Problem 55E

(a)

Interpretation Introduction

Interpretation: The successive half-lives and the initial concentration of a reaction is given. By using these values, the concentration of $\text{A}$ is to be calculated for each given time.

Concept introduction: The change observed in the concentration of a reactant or a product per unit time is known as the rate of the particular reaction. The differential rate law provides the rate of a reaction at specific reaction concentrations.

To determine: The concentration of $\text{A}$ at $\text{80}\text{.0}\min$.

(b)

Interpretation Introduction

Interpretation: The successive half-lives and the initial concentration of a reaction is given. By using these values, the concentration of $\text{A}$ is to be calculated for each given time.

Concept introduction: The change observed in the concentration of a reactant or a product per unit time is known as the rate of the particular reaction. The differential rate law provides the rate of a reaction at specific reaction concentrations.

To determine: The concentration of $\text{A}$ at $\text{30}\text{.0}\min$.