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31 July, 09:46

Determine the number of atoms in 1.85 ml of mercury. (the density of mercury is 13.5 g/ml.)

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  1. 31 July, 10:14
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    First step is to get the mass of the mercury:

    Pressure = mass/volume

    mass = pressure x volume = 13.5 x 1.85 = 24.975 gm

    Second step is to calculate the number of moles in 24.975 gm:

    From the periodic table, the molar mass of mercury is 200.59

    mass = number of moles x molar mass

    number of moles = 24.975 / 200.59 = 0.1245 mole

    Last step is to get the number of atoms:

    Each mole contains 6.02 x 10^23 atoms

    number of atoms = 0.1245 x 6.02 x 10^23 = 7.4949 x 10^22 atoms
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