How many oxygen atoms are in 3.80 g of quartz?

Answer 1

Ans:Quartz is SiO2. It has a formula weight of 60.1 g/mol.

3 grams of SiO2 is 0.05 moles.

Each mole of SiO2 has 0.1 moles of oxygen since there are 2 oxygen atoms per formula unit of SiO2.

(1 mole of anything is 6.02x1023 of anything.)

0.1 mol oxygen atoms x 6.02x1023 oxygen atoms / mol oxygen atoms= 6.02 x 1022 oxygen atoms.

Number of O atoms =6.02×1022

Answer 2

Using SiO2.

3.80 grams SiO2 (1 mole SiO2/60.09 grams)(2 mole O/1 mole SiO2)(6.022 X 1023/1 mole O)

= 7.62 X 1022 atoms of oxygen

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Now, quartz shares oxygen and can be found as SiO4, so all you would do is change the molar mass.

Answer 3

Quartz is SiO2 which is 60.08g/mol. So 3.5g of SiO2 is 3.5g/60.08g/mol = 0.058mol

Oxygen is 16.0g/mol, so (2X16.0g/mol)/(60.08g/mol)X100% = 53.3% of SiO2.

0.058mol X .533 = .031 moles of oxygen. Multiplying that with Avagadro's number:

6.022×1023 mol-1 X .031 moles of oxygen = 1.87×1022 oxygen atoms.

Answer 4

3.30 gSiO2 / 60.085g SiO2 x 2 mol 0 / 1 mol SiO2 x (6.022*1023 )

= 6.61*1022 O atoms

Answer 5

28

Answer 6

7.22x10^22

Answer 7

9/13