Homework Help: Chemistry

Posted by Anonymous on Saturday, December 1, 2012 at 4:44pm.

A sample of charcoal is found to have only 1/8th of Carbon-14. Half-life of Carbon-14 is 5730yrs, what is the age of the charcoal?

Chemistry - DrBob222, Saturday, December 1, 2012 at 4:49pm
k = 0.693/t_1/2
Substitute and solve for k.

ln(No/N) = kt
Pick any convenient number for No, such as 100.
Then N = 1/8 that or 12.5
k = from above.
Solve for t in years if half life is in years.

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