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April 18, 2015

Homework Help: Chemistry

Posted by Becky on Thursday, October 10, 2013 at 11:36am.

Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years. A rock is found to contain 82.7% of the amount of uranium-238 that it contained when it was formed. (The amount that the rock contained when it was formed can be deduced from the presence of the decay products of U−238.)

How old is the rock in years?

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