How many oxygen atoms are in 4.00 g of quartz?

1 mole of SiO2 has a mass of 60.1 g/mol , & has 2 moles of oxyhen atoms:
4.00g SiO2 @ (2 moles of O) / (60.1 g/mol SiO2) = 0.1331 moles of oxygen
find atoms of oxygen, using avagadro’s number:
0.1331 mol oxygen @ 6.022e23 atoms / mole = 8.016 e22 atoms
your answer: 8.02 e22 atoms of oxygen

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