Question #03651

1 Answer
Feb 10, 2018

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