A 236mL sample of an aqueous solution contains 3.20 %MgCl2 by mass (molar mass of MgCl2 is 96.9 g/mol). Exactly one-half of the magnesium ions are Mg?28, a beta emitter with a half-life of 21 hours.
What is the decay rate of Mg?28 in the solution after 4.00 days? (Assume a density of 1.02 g/mLfor the solution.)
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