Posted by **Ashley** on Sunday, July 1, 2012 at 6:59pm.

The disintegration of a radioisotope, such as I-131 to Xe-131, is another example of a first-order reaction.

It has a half-life of 8.0 days.

I-131 -> Xe-131 + e

If you start with 1.40 g I-131, how many grams of I-131 will be left after the following days?

PLEASE HELP!!!!

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