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21. A first-order reaction is 45% complete at the end of 35 minutes. What is the length of the half-life of this reaction? a) 41 min b) 39 min c) 30. min d) 27 minne of these ANS: a) 41 min PAGE: 12.4 How do you solve this. I think you have to use the integrated rate law but I'm not sure how.
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