Homework Help: CHemistry

Posted by Devin BOutte on Wednesday, November 16, 2011 at 8:02pm.

Given that the half life of c 14 is 5,700 ,use the method c 14 dating to determine the age of a fossil if it has 25% of c 14 compared to living specimen.

CHemistry - DrBob222, Wednesday, November 16, 2011 at 11:22pm
k = 0.693/t_1/2
Calculate k and substitute into the following:
ln(No/N) = kt.
Use No = 100
N = 25
k from above.
Solve for t. I estimated about 11,000 years but you need to calculate it more accurately and remember the number of significant figures.

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