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If the half-life of a reaction is 6 days. What percentage of material is left after 18 days?
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Answer:

12.5% is left

Explanation:If the half-life of a reaction is 6 days. What percentage of material is left after 18 days?

18 days/6 days = 3 half lives

each half life you lose half the material

in 3 half lives you have (1/2)x (1/2) x (1/2) =1/8

1/8 =0.125 so 12.5% is left

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