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I need help with this questions. The sugar fructose contains 40.0%C,6.7%H, and 53.3%O by mass. A solution of 11.7g of fructose in 325g of ethanol

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The sugar fructose contains 40.0%C,6.7%H, and 53.3%O by mass. A solution of 11.7g of fructose in 325g of ethanol has a boiling point of 78.59C. The boiling point of ethanol is 78.35 ?C, and Kb for ethanol is 1.20Ckg/mol. What is the molecular formula of fructose

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