Posted by Matthew on Sunday, March 17, 2013 at 11:03pm.
A quantity of oxygen gas had 16.32 g of the radioactive isotope oxygen19 in it. When measured exactly 10 minutes later, the amount of oxygen19 was 0.964 g. What is the halflife, in seconds, of oxygen19?

math  Reiny, Monday, March 18, 2013 at 12:05am
16.32(1/2)^(t/k) = .964 , where t is in minutes, and k is the halflife in minutes.
(.5)^(10/k) = .0590686.. ( I stored it)
ln both sides
(10/k) ln .5= ln (.059068...)
10/k = 4.081464...
k = 2.4504 minutes or 147.006 seconds
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