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22 December, 08:45

If you were presented with 2 l of a 2 m sucrose stock solution, how many grams of sugar would be in a 100 ml aliquot?

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  1. 22 December, 09:04
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    Answer;

    68.46 g of sucrose in 100mL

    Solution and explanation;

    Given 2L of 2 mol/L sucrose solution

    Moles = concentration x volume

    Therefore; The number of moles in this solution is 2 L x 2 mol/L = 4 mol

    The molecular mass of sucrose is 342.3 g/mol.

    Mass = Moles * Molecular weight

    Therefore the mass of sucrose in 2 L;

    = 4 mol x 342.3 g/mol = 1369.2g

    but; 2L/20 = 100 mL

    = 1369.2/20 = 68.46

    Hence; you would have 68.46 g in 100 mL
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