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 component A forming compound B was studied and the following data were collected: What is the average reaction rate between 0. and 1500. s? Express your answer to three significant figures and include the appropriate units. Part B What is the average reaction rate between 500. and 1500. s? Express your answer to three significant figures and include the appropriate units. Part C What is the instantaneous rate of the reaction at t = 800. s? Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

A) Average rate 0 - 1500 sec = (0.016-0.184)/(1500-0) = -1.12 * 10-4 M/s

The negative sign indicates a decrease in the concentration of the reactant A with time.

Ans: Av rate = 1.12 * 10-4 M/s

B) Average rate 500 - 1500 sec = (0.016-0.069)/(1500-500) = -5.30 *10-5 M/s

Again, negative sign indicates that the reactant concentration decreases over time.

Ans : Av rate = 5.30 * 10-5 M/s

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