Quartz, which contains one silicon atom and two oxygen atoms per formula unit, i

Question

Quartz, which contains one silicon atom and two oxygen atoms per formula unit, is the second-most-common mineral on Earth after feldspar. It is used as a gemstone, as well as in pressure gauges, oscillators, resonators, wave stabilizers, heat-ray lamps, and prismastic lenses, and in the manufacture of glass, paints, abrasives, and precision instruments such as watches.

1) What is the chemical formula for quartz?
2)How many oxygen atoms are in 2.20 of quartz?

• 4 years ago

Quartz, which contains one silicon atom and two oxygen atoms per formula unit, is the second-most-common mineral on Earth after feldspar. It is used as a gemstone, as well as in pressure gauges, oscillators, resonators, wave stabilizers, heat-ray lamps, and prismastic lenses, and in the manufacture of glass, paints, abrasives, and precision instruments such as watches.

1) What is the chemical formula for quartz?
2)How many oxygen atoms are in 2.20 of quartz?

Explanation / Answer

I) SiO2

2)

Mass of SiO2 = 28 + 32 = 60

moles of SiO2 = 2.20/60 = 0.036

Moles of O in 0.036 moles SiO2 = 0.036x 2 =0.072

Number of O atoms = 0.072x 6.022 x 10^23 = 4.33 x 10^22

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