Problem: An average reaction rate is calculated as the change in the concentration of reactants or products over a period of time in the course of the reaction. An instantaneous reaction rate is the rate at a particular moment in the reaction and is usually determined graphically.The reaction of compound A forming compound B was studied and the following data were collected:Time (s)                    [A] (M)0.                               0.184200.                           0.129500.                           0.069 800.                           0.0311200.                         0.0191500.                         0.016a. What is the average reaction rate between 0 s and 1500 s?b. What is the average reaction rate between 500 s and 1200 s?c. What is the instantaneous rate of the reaction at t = 800 s?

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FREE Expert Solution

Average rate of reaction

Rate=Δ[A]Δt


a. What is the average reaction rate between 0 s and 1500 s?

***Since A is a reactant, the rate with respect to A is negative (–) since we’re losing reactants.

ΔAΔt=-Afinal-Ainitialtfinal-tinitial

Δ[A]Δt=-0.016 M-0.184 M1500-0 s

Δ[O2]Δt1.12×10‒4 M/s


b. What is the average reaction rate between 500 s and 1200 s?

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Problem Details

An average reaction rate is calculated as the change in the concentration of reactants or products over a period of time in the course of the reaction. An instantaneous reaction rate is the rate at a particular moment in the reaction and is usually determined graphically.

The reaction of compound A forming compound B was studied and the following data were collected:

Time (s)                    [A] (M)

0.                               0.184

200.                           0.129

500.                           0.069 

800.                           0.031

1200.                         0.019

1500.                         0.016

a. What is the average reaction rate between 0 s and 1500 s?

b. What is the average reaction rate between 500 s and 1200 s?

c. What is the instantaneous rate of the reaction at t = 800 s?

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Based on our data, we think this problem is relevant for Professor Magner's class at LONESTAR.