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2. 2.5 grams of crushed alertness tablets generated 1.71 grams of crude caffeine, after recrystallization there was 1.35 grams of pure caffeine. What is the

2. 2.5 grams of crushed alertness tablets generated 1.71 grams of crude caffeine, after recrystallization there was 1.35 grams of pure caffeine. What is the \% recovery of pure caffeine? What % of the alertness tablets were caffeine

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