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[5 pts] How many half life takes a substance down to its 25.5% of its initial concentration? Hint: Consider the substance follows a first-order reaction.

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[5 pts] How many half life takes a substance down to its 25.5% of its initial concentration? Hint: Consider the substance follows a first-order reaction. 4 5 2 0 [ 5 points] How many half life takes a substance down to its 50% of its initial concentration? Fint: Consider the substance follows a first-order reaction

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