2.2 - 2 2.2 dC = kC dt ln Cf Ci = kt ln 2 t If Cf = 0.5 Ci...

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2.2 ln f i C dC kC kt dt C =− If C f = 0.5 C i ln 0.5 = - kt or ln 2 k t = for a half life of seven years k = 0.099 years -1 so that
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