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13 April, 01:35

What amount (moles) is represented by each of these samples? (a) 22.5 mg lye, NaOH mol (b) 2.57x1021 molecules of chalk, CaCO3 mol (c) 1.46 g of sucrose, C12H22011 mol

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  1. 13 April, 03:23
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    a) 0.0005625 moles NaOH

    b) 0.00427 moles CaCO3

    c) 0.00427 moles sucrose

    Explanation:

    (a) 22.5 mg lye, NaOH mol

    Moles = mass / molar mass

    Moles = 0.0225 grams / 40 g/mol

    Moles = 0.0005625 moles NaOH

    (b) 2.57*10^21 molecules of chalk, CaCO3 mol

    Moles = molecules / number of Avogadro

    Moles = 2.57*10^21 / 6.022*10^23

    Moles = 0.00427 moles CaCO3

    (c) 1.46 g of sucrose, C12H22011 mol

    Moles = 1.46 grams / 342.3 g/mol

    Moles = 0.00427 moles sucrose
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