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Chemistry
Nathalie Booth
5 April, 06:29
How many oxygen atoms are in 2.80 g of quartz?
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Spunky
5 April, 06:48
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The chemical formula for quartz is SiO₂
Percentage by mass of oxygen = (2 x 16) x 100 / (28 + 2 x 16)
Percentage by mass of oxygen = 53.3%
Mass of oxygen in sample = 0.533 x 2.8
Mass of oxygen = 1.49 grams
Moles of oxygen = 1.49 / 16
Moles = 0.093
One mole contains 6.02 x 10²³ particles
Thus, the atoms of oxygen:
0.093 x 6.02 x 10²³
= 5.6 x 10²²
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