Problem: The decomposition of Br2 is followed as a function of time; two different plots of the data are shown here. Determine the order and rate constant for the reaction.

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plot with straight line  order for the reaction


plot of ln[Br2] vs time  straight line 


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Problem Details

The decomposition of Br2 is followed as a function of time; two different plots of the data are shown here.

The figure shows natural logarithm of the decomposition of Br2 as a function of time. The decomposition is measured from minus 2.5 to 0 on the y-axis and time is measured from 0 to 80 seconds on the x-axis. The curve is a straight line and goes down from 0 units of decomposition at 0 seconds to minus 2.25 units of decomposition at 75 seconds. The figure shows the 1 divided by the concentration of Br2 as a function of time. The reverse concentration is measured from 0 to 10 units on the y-axis and time is measured from 0 to 80 seconds on the x-axis. The curve starts at 1 unit of reverse concentration at 0 seconds and grows exponentially. Some of its points are: 2 units at 25 seconds, 4 units at 45 seconds, and 9.5 units at 73 seconds.

Determine the order and rate constant for the reaction.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Identifying Reaction Order concept. If you need more Identifying Reaction Order practice, you can also practice Identifying Reaction Order practice problems.

What professor is this problem relevant for?

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