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scme1702
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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