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The half-life of sodium-24 is 15 minutes. What was the original mass of Na-24 if 5.0 g remains after 1 hour?

20 g
40g
80g
100g

User SandeepM
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2 Answers

4 votes
The half life of sodium 24 is 15 minutes. What’s the original mass of Na 24 if 5.0g remains after 1 hour
answer
40g
User Terik
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2 votes

40g remains after an hour.

User Nurit
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