Posted by **L** on Saturday, February 4, 2012 at 9:02pm.

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) 15.50 10.90 7.67 5.39 3.79

Determine the rate constant in units of day^(-1).

- chemistry -
**DrBob222**, Saturday, February 4, 2012 at 9:27pm
I would do this.

ln(No/N) = kt

No = what you started with.

N = what you ended up with.

k = what you're looking for.

t = time = 4 days

I would plug in all the data, find k for each 4 day period, then average all of the values of k together.

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