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.

## Answer This Question

## Related Questions

- Calculus - The rate of decay is proportional to the mass for radioactive ...
- MATH! - The mass of a radioactive substance follows an exponential decay model, ...
- Calculus - a certain radioactive substance is decaying so that at time t, ...
- calculus - The rate at which an amount of a radioactive substance decays is ...
- math - if the rate for radioactive decay for a substance is r=-.0063 and time is...
- College Chemistry - The following data are obtained for the decomposition of ...
- Calculus-derivatives - Verify if these are correct answers. 1. The derivative of...
- Science - Radiation - A radioactive isotope, used in the agricultural industry ...
- Chemistry - 27. Excess exposure to nuclear radiation can cause harm. All of the ...
- advanced functions HELP!!! - Radioactive decay is the process by which an ...

More Related Questions