Chemistry Practice Problems Identifying Reaction Order Practice Problems Solution: The decomposition of Br2 is followed as a function...

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Solution: 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.

Problem

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.