Interpretation: The average
Concept introduction: The average rate of an action or process is defined as the change in a given quantity during a specific period of time. In equation form, the average rate is expressed as follows:
Average rate=ΔQuantityΔt

Answer to Problem 12SSC
The average reaction rate of the reaction is 0.25 mol/(L· s) .
Explanation of Solution
Given that A and B react and concentration of A changes from 1.00 M to 0.50 M in 2 seconds. Decrease of concentration means the rate of expression is negative.
So, the expression of the average reaction rate is,
Average reaction rate=−Δ[A]Δt=−[A] at time t2−[A] at time t1t2−t1=−0.50 M −1.00 M2 s=0.50 M2 s=0.25 mol/(L· s)
The negative sign in reaction expression indicates that the concentration of the compound decreases as the reaction proceeds but the reaction rate is always positive.
Chapter 16 Solutions
Chemistry: Matter and Change
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