Posted by **bme1** on Monday, May 17, 2010 at 9:14pm.

so if my graph is absorbance vs time in minute, then my half life formula should give me time in minute right?

- chemistry -
**GK**, Monday, May 17, 2010 at 9:44pm
The answer is "yes" but I am not sure what formula you are referring to.

Are you expected to use the absorbance v. time graph to get the half-life? If so,

•Select a point on the graph with a high value for absorbance, A. Read the time in minutes, T1.

•On the absorbance axis, find the point corresponding to half of the value above. Use the graph to find the time for the new absorbance value, T2.

• Half-life, T(half) = T2-T1

If you repeat this process with another pair of points, you should get the same half life. I assume you are dealing with a first order reaction, and the absorbance is proportional to the concentration of a reactant that keeps decreasing.

## Answer this Question

## Related Questions

- Chemisty - The activity of a radioisotope is 3000 counts per minute at one time ...
- math, psychology, puzzle - you have a 5 minute hourglass and a 9 minute hour ...
- algebra - could someone explain to me how to do this problem i dont even know ...
- Chemistry - Help! If I have 0.0031 absorbance/sec, how would I convert this to ...
- Chemistry - a sample of radioisotope has a count rate measured by a Muller-...
- physics - If the physical half-life of sulfur-35 is 87.1 days, and the biologic...
- Algebra II - Word Problem - A convenience store clerk can wait on 6 customers ...
- Algebra II - Word Problem - A convenience store clerk can wait on 6 customers ...
- Chemistry Help - If a graph is given for a cuvette using a 1.00 cm , predict the...
- physics? - The minute hand of a bedside clock is 2.5 cm long. In order for the ...

More Related Questions