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

Answer:

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 * $\frac{1mol}{60.08g}$ = 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 * $\frac{2molO}{1molSiO_{2}}*\frac{6.023*10^{23}atomsO}{1molO}$ = 4.61 * 10²² atoms of O