Question

If you have 1.005 x 1024 molecules of Ca(OH)2 how many atoms do you have? Moles? Grams?

Answer 1

Answer:

• 5.025x10²⁴ atoms

• 1.6686 moles

• 123.63 g

Explanation:

In one Ca(OH)₂ molecule, there are 5 atoms (1 Ca, 2 O and 2 H). This means that in 1.005x10²⁴ Ca(OH)₂ molecules, there are (5 * 1.005x10²⁴) 5.025x10²⁴ atoms.

To convert molecules into moles, we use Avogadro's number:

• 1.005x10²⁴ molecules * $\frac{1mol}{6.023*10^{23}molecules}$ = 1.6686 moles

Finally, we convert moles into grams using the molar mass of Ca(OH)₂:

• 1.6686 moles * 74.093 g/mol = 123.63 g