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9 September, 17:38

How many oxygen atoms are in 1.60 g of quartz? hints?

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  1. 9 September, 18:04
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    Quartz has the formula SiO2

    From the periodic table:

    mass of oxygen = 16 grams

    mass of silicon = 28.0855 grams

    Mass of one mole of quarts = 28.0855 + 2 (16) = 60.0855 grams

    number of moles = mass / molar mass

    number of moles = 1.6 / 60.0855 = 0.0266 moles

    Each mole of quartz contains Avogadro's number of atoms.

    Therefore:

    number of atoms in 1.6 g = 1.6 x 6.02 x 10^23 = 1.603 x 10^22 atoms
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