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27 June, 22:37

Calculate the mass (in grams) of cobalt that has the same number of atoms as 521 mg of silicon.

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  1. 27 June, 23:00
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    The atomic mass of silicon is 28 g/mol.

    Therefore, 521 mg or 0.521 g will be equivalent to;

    0.521/28 = 0.01861 mooles

    Atomic mass of cobalt is 27 g/mol

    According to Avogadro's law the mass of cobalt that will have the same atom as 52 mg of silicon will be;

    (0.01861 moles * 27) = 0.5024 g or 502.4 mg
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