Asked Feb 18, 2019

Two part question. Thank you in advance!

Radioactive materials are often used in biological studies. A radiation biologist studies the rate of decomposition of a certain substance and obtains the following data:

Time (days) 0 4.0 8.0 12.0 16.0
Mass (μg) 13.00 8.85 6.03 4.11 2.80
Determine the rate constant in units of days-1.


How many micrograms will remain after 40 days?


Expert Answer

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Step 1

Part A:

In the first part of question, we are asked to calculate rate constant in units of Days-1. Though it is not given in the question that the given decay follows first order reaction.

But the unit of rate constant tell us that this decay follows first order reaction as in only first order reaction the unit of rate constant is sec-1, min-1 or days-1.

Step 2

Integral equation of first order reaction:

Step 3

Here we ha...


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Chemical Kinetics

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