STEP - BY - STEP EXPLANATION
What to find?
Average rate of the reaction from 20-40 seconds.
Given:
The average rate of the reaction from 20-40 seconds can be calculated following the steps below:
Step 1
State the formula.
[tex]average\text{ rate of change}=\frac{change\text{ in concentration}}{change\text{ in time}}[/tex]
[tex]=\frac{f(b)-f(a)}{b-a}[/tex]
From the graph given:
If a =20, f(a) =0.14
If b =40 , f(b) = 0.11
Step 2
Substitute the values into the formula.
[tex]=\frac{0.11-0.14}{40-20}[/tex]
Step 3
Simplify
[tex]=\frac{-0.03}{20}[/tex][tex]=-0.0015[/tex]
ANSWER
The average rate of change is -0.0015 M/L/sec.
