A 228 mL sample of an aqueous solution contains 2.35%
Chapter 19, Problem 94E(choose chapter or problem)
A 228 mL sample of an aqueous solution contains 2.35% 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 of Mg-28 in the solution after 4.00 days? (Assume a density of 1.02 g>mL for the solution.)
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