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The problem was not given. If it has a constant rate of 6.70 times 10 up to the 3. the half life would be 0.693 k. So one eighth of initial value would be calculated by multiplying one half by its self 3 times. So it would be 3 half lifes.

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Q: How long will it take for the reactant concentration to drop to 18 of its initial value?
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