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Suppose that in the synthesis of benzoic acid , a student uses 1.09 grams of magnesium...

Suppose that in the synthesis of benzoic acid , a student uses 1.09 grams of magnesium , 7.83 grams of bromobenzene , and 21.196 grams of dry ice. If the mass of benzoic acid obtained were 4.13, what was the percent yield?

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