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Social ScienceHow many oxygen atoms are in 4.00 g of quartz?
Expert Answer
Quartz is nothing but SiO2
2 moles of oxygen atoms per mole of SiO2
mass of quartz (SiO2) given = 4 g
moles of SiO2 = mass of quartz/molar mass of SiO2
molar mass of SiO2 = 60.1 g/mol
So,
moles of quartz = 4 g/60.1 g/mol = 0.0665 mol
We already know that 1 mole of SiO2 has 2 moles of Oxygen in it.
So, 4 g quartz will have = 2 x 0.0665 mol = 0.1331 mol Oxygen
To get number of atom,s we have to multiply moles with avogadro's...
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