An average reaction rate is calculated as the change in the concentration of rea

Question

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:

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

rate = ??? (3 sig figs)

What is the average reaction rate between 200. and 1200.s ?

rate = ??? (3 sig figs)

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

rate = ?? (2 sig figs)

First CORRECT answer gets the points. :)

Time (s) [A] (M) 0. 0.184 200. 0.129 500. 0.069 800. 0.031 1200. 0.019 1500. 0.016

Explanation / Answer

Average rate = (0.184-0.016 M) / 1500 s=1.12*10^-4

Average rate = (0.129 - 0.019 M) / 1000 s=1.1*10^-4

For the third one, you need to graph the points and determine the slope of the line at t=800 seconds.

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