Posted by lan on Thursday, November 29, 2012 at 3:43pm.
x = Xi e^-kt
1/2 = e^-24 k
ln .5 = -24 k
-.693 = -24 k
k = .0289
so
x = 220 e^-.0289*168
= 220 * .00779
= 1.71 grams
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