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19 October, 14:23

The density of water is 1.00 g/ml at 4°c. how many water molecules are present in 2.56 ml of water at this temperature?

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  1. 19 October, 14:56
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    8.55 * 10²² Molecules

    Solution:

    Step 1: Calculate the Mass of Water as;

    Density = Mass : Volume

    Solving for Mass,

    Mass = Density * Volume

    Putting values,

    Mass = 1 g. mL⁻¹ * 2.56 mL

    Mass = 2.56 g

    Step 2: Calculate Moles of Water as,

    Moles = Mass : M. Mass

    Putting values,

    Moles = 2.56 g : 18 g. mol⁻¹

    Moles = 0.142 mol

    Step 3: Calculate Number of Molecules of Water as,

    # of Molecules = Moles * 6.022 * 10²³

    Putting value of mole,

    # of Molecules = 0.142 * 6.022 * 10²³

    # of Molecules = 8.55 * 10²² Molecules
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