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2 June, 17:48

Determine the number of atoms in 1.75 ml of mercury. (the density of mercury is 13.5 g/ml.)

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  1. 2 June, 20:49
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    The number of atoms in 1.75 ml of mercury is 7.1036 x10^22 atoms

    calculation

    find mass of Hg = M xV

    =1.75 ml x 13.5 g/ml = 23.625 grams

    find the number of moles of Hg = mass/molar mass

    moles = 23.625g/200.56g/mol=0.118 moles

    by use of Avogadro law that is 1 mole = 6.02 x10^23 atoms

    0.118 moles=? atoms

    by cross multiplication

    = (0.118 moles x6.02 x10^23atoms) / 1 mole = 7.091 x10^22 atoms
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