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3 October, 12:41

g What mass (in g) of a concentrated solution of nitric acid (69.0% HNO3 by mass) is needed to prepare 364.5 g of a 12.2% solution of HNO3 by mass?

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  1. 3 October, 14:50
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    64.4 g of concentrated nitric acid solution are needed.

    Explanation:

    First we calculate the mass of HNO₃ contained in 364.5 g of a 12.2% solution:

    364.5 gsolution * 12.2 gHNO₃/100gsolution = 44.47 g HNO₃

    Now we calculate how many grams of the concentrated solution would contain 44.47 grams of HNO₃:

    44.47 g HNO₃ * 100 g solution / 69.0 = 64.45 g concentrated solution

    So 64.4 g of concentrated nitric acid solution are needed.
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