1. Converting moles to the number of atoms

2. Consider these questions:
How many oxygen atoms in each representative particle?
CaCO3
Al2(SO4)3
How many ions in the following?
CaCl2
NaOH
3 atoms of oxygen
12 (3 x 4) atoms of oxygen
3 total ions (1 Ca2+ ion and 2 Cl1- ions)
2 total ions (1 Na1+ ion and 1 OH1- ion)
5 total ions (2 Al SO42- ions)

3. Practice problems page 292

4. Pg 292 sample problem
Propane is a gas used for cooking and heating. How many atoms are in 2.12 mol of propane (C3H8)?

5. Independently you will complete Q5 and Q6 on page 292