Question

Question #03651

Answer 1

`1.204*10^23` ions

Explanation:

First, convert grams into moles.
#5.61 g CaO (1 mol/56.077 g) = 0.100 mol CaO

Next, find the number of molecules in 1 mole of CaO
`1 mol = 6.022 * 10^23` molecules

Use that to convert moles into molecules.
`0.100 mol CaO (6.022 * 10^23` molecules`/1 mol) = 6.022 *10^22` molecules

Finally, find the number of ions in 1 molecule, and use that to find the number of ions.
CaO = Ca2+ + O2- `rarr` 2 ions per molecule
`6.022 *10^22` molecules`(2`ions`/1`molecule`) = 1.204 *10^23`ions