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.

- CHemistry -
**Katy**, Thursday, April 17, 2014 at 10:20am
I don't really now this, but I suggest looking on google because they have many many answers and if you find out what this is then let me know!

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