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A 2000-Ng Sample of Sodium-24 Was Stored in a Lead-Lined Cabinet

Question 79
Multiple Choice
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Multiple Choice

A 200.0-ng sample of sodium-24 was stored in a lead-lined cabinet for 45 hours.The half-life of sodium-24 is 15 hours.How much sodium-24 remains?

A)100 ng
B)75 ng
C)50 ng
D)25 ng
E)13 ng

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