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3 January, 14:27

How many oxygen atoms are in 1.90 g of quartz?

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  1. 3 January, 15:26
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    The chemical formula for quartz is SiO₂. It has a molar mass of 60.08 g/mol. We use this to find the moles of quartz.

    Moles of quartz = 1.90 g (1 mol/60.08 g) = 0.03162 moles

    From the chemical formula, there are 2 moles of Oxygen per 1 mole of SiO₂.

    Moles of oxygen = 0.03162 moles*2 = 0.063249 moles O

    We use the Avogadro's number, 6.022*10²³ atoms/mole, to find the number of oxygen atoms.

    0.063249 moles O * 6.022*10²³ atoms/mole = 3.81*10²² atoms of oxygen
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