Chapter 13, Problem 1SAQ

Q1. This graph shows the concentration of the reactant A in the reaction A → B. Determine the average rate of the reaction between 0 and 10 seconds.

a) 0.07 M/s

b) 0.007 M/s

c) 0.86 M/s

d) 0.014 M/s

Interpretation Introduction

Introduction: The rate of change of concentration of products and reactants with respect to time is called the average rate of the reaction.

Answer to Problem 1SAQ

Correct answer: The average rate of the reaction is $0.014\text{ M/s}$.

Therefore, option (d) is correct.

Explanation of Solution

Justify reasons for the correct statement:

The average rate of the reaction is written as follows:

$r=-\frac{\Delta \left[A\right]}{\Delta t}$

So,

$\begin{array}{c}r=-\frac{\Delta \left(1.00\text{ M}-0.86\text{ M}\right)}{10.0\text{ s}}\\ =0.014\text{ M/s}\end{array}$

Hence, option (d) is correct.

Conclusion

The average rate of the reaction between 0 and 10 seconds is $0.014\text{ M/s}$.