Homework Help: Chemistry

Posted by John on Sunday, January 6, 2013 at 2:27pm.

A radioactive element has a half-life of 6.41 days. What percent of the original sample will be left after 15.0 days?

Chemistry - bobpursley, Sunday, January 6, 2013 at 2:48pm
estimate: that is over 2 half lives, guessing 20 percent. The math

amountremaining=original*e^(-ln2*15/6.42)

decimal percent=e^(-ln2*15/6.42)=.199
or 19.9 percent
Chemistry - John, Sunday, January 6, 2013 at 5:47pm
Thanks

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