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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Asked Jan 7, 2020
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  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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Expert Answer

Step 1

Given,

228mL sample contains 2.35% MgCl2 by mass. 

Half-life = 21 hours = 1260min = 75600 seconds.

Density of the solution = 1.02g/mL.

Step 2

The mass of the sample ca...

Chemistry homework question answer, step 2, image 1
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