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16 November, 21:40

A student placed 19.0 g of glucose (c6h12o6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.-ml mark on the neck of the flask was reached. the flask was then shaken until the solution was uniform. a 45.0-ml sample of this glucose solution was diluted to 0.500 l. how many grams of glucose are in 100. ml of the final solution? express your answer numerically in grams.

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  1. 16 November, 22:09
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    moles glucose = 19 g / 180 g/mol = 0.105

    M = 0.105 / 0.100 L = 1.05

    moles in 20.0 mL = 1.05 M x 0.0200 L = 0.0216

    New concentration = 0.0216 / 0.500 L = 0.0432 M

    moles in 100 mL = 0.100 L x 0.0432 = 0.00432

    mass = 0.00432 x 180 g/mol = 0.778 g
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