A 224ml sample of an aqueous solution contains 2.80 mgcl2, Ask an Expert

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A 224mL sample of an aqueous solution contains 2.80% MgCl2 by mass. 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 (in atoms/day) of Mg-28 in the solution after 4.00 days? (Assume density of 1.02 g/mL for the solution)

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