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physical chemistry

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How many grams of NaC2H3O2 (M = 82.034 g mol-1) should be dissolved in 400.0 g of water to prepare a solution which is 11.28 % NaC2H3O2 by mass?

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    Solve this equation for X:

    X / (400 + X) = 0.1128

    400 + X is the total number of grams in the resulting mixture. You do not need to use the number of grams per mole.

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