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Romashka-Z-Leto [24]
2 years ago
9

Need help with this question

Chemistry
2 answers:
algol [13]2 years ago
7 0
The answer is Or I think is C
PilotLPTM [1.2K]2 years ago
5 0
I’m not 100% sure but I think it’s C
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What is the half-life of an isotope that decays to 6.25% of its original activity in 18.9 hours?
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Now, for 1st order reactions: half life = \frac{0.693}{k} =  \frac{0.693}{0.1467} = 4.723 hours.


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