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13 January, 09:55

Find the molarity of a 40.0 % by mass aqueous solution of sulphuric acid H2SO4 for which the density is 1.3057 g/ml

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  1. 13 January, 10:06
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    5.33 mol/L.

    Explanation:

    Its density is 1.3057 g/ml so in a liter (1000 mL) there is 1305.7 g of solution, but only 40% is sulfuric acid.

    0.40x1305.7=522.28

    So in a liter of 40% sulfuric acid solution there is 522.28 g of sulfuric acid.

    Sulfuric acid molar mass iss 98.079 g/mol, so in 522.28 g of sulfuric acid there is

    522.28 g / 98.079 g/mol=5.33 mol

    In one liter of solution there is 5.33 mol of sulfuric acid, so the molarity of such solution is 5.33 mol/L.
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