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25 September, 20:50

A bottle contains 6.23 g of copper turnings. The mass of a length of magnesium ribbon is 6.23 g. Are there more copper atoms or more magnesium atoms present?

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  1. 25 September, 21:52
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    Moles = mass (g) / molar mass (g/mol)

    Molar mass of copper = 63.5 g/mol

    Molar mass of magnesium = 24.3 g/mol

    Moles of copper = 6.23 g / 63.5 g/mol = 0.098 mol

    Moles of magnesium = 6.23 g / 24.3 g/mol = 0.256 mol

    according to the Avogadro constant,

    1 mol = 6.022 x 10²³

    Hence,

    atoms of copper = 0.098 x 6.022 x 10²³ = 5.902 x 10²²

    atoms of magnesium = 0.256 x 6.022 x 10²³ = 15.416 10²²

    Hence magnesium ribbon has more atoms.
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