Sodium-24 Has a Half-Life of 15

question 52

Multiple Choice

Sodium-24 has a half-life of 15.0 hours. Suppose you had a sample containing 0.010 moles of Na-24. How many hours would be required to reduce your sample to 6.25 × 10 ^{− 4} moles?

• A)120
• B)60
• C)45
• D)30

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