Question

How many oxygen atoms are in 2.30 g of quartz?

Answer 1

4.61*10^22 oxygen atoms in 2.30 quartz

Answer 2

4.61 * 10²² oxygen atoms

Step-by-step 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 *
`(1mol)/(60.08g)` = 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 *
`(2molO)/(1molSiO_(2))*(6.023*10^(23)atomsO)/(1molO)` = 4.61 * 10²² atoms of O