How many oxygen atoms are in 2.30 g of quartz?

4.61 * 10²² oxygen atoms

Explanation:

Quartz is the common name of a silicon mineral, SiO₂. To solve the problem, we need to calculate the molar mass (MM) of quartz:

MM = AtomicMass of Si + 2 * AtomicMass of O

MM = 28.08 + 2 * 16

MM =  60.08 g/mol

Then we can calculate how many moles of quartz are in 2.30 g:

2.30 g * = 0.0383 mol

Then we use Avogadro's number calculate the number of oxygen atoms in 0.0383 mol of SiO₂, keeping in mind the number of O per quartz molecule:

0.0383 mol SiO₂ * = 4.61 * 10²² atoms of O

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