1. Remembering Scientific Notation…..
3.4 x 10-5
0.001
5.6 x 103

2. The Mole

3. The MOLE Main unit in chemistry we will use ! ! !
Describes the amount of atoms in a particular substance
1 mole = 6.02 x 1023 atoms (KNOW THIS CONVERSION)
1 mole = formula mass (g) of a compound
= atomic mass (g) of an element
= 22.4 L of a solution under STP

4. Example 1: Carbon
1 mole = grams

5. Example 2: Aluminum
1 mole = grams

6. Molar Mass
= mass of 1 mole of a substance
Units = grams/mole or g/mol

7. How many atoms are in 1 mole?
1 mole = 6.02 x 1023 atoms “Avogadro’s number”

8. Example 1
How many atoms are in 1 mole of Mg?
How many atoms are in 1 mole of C?

9. MOLE CONVERSIONS

10. Remember…..
1 mole =
6.02 x 1023 atoms of element/molecules of chemical compound
Atomic mass of element
Formula mass of a compound

11. 3 types of problems Grams to moles, Moles to grams
Atoms to moles, Moles to atoms
Grams to atoms, Atoms to grams

12. Example 1:
2 moles Carbon grams
24g C

13. Calcium has a mass of 10.0g. How many moles of Calcium? Atoms?
Example 2:
Calcium has a mass of 10.0g. How many moles of Calcium? Atoms?
0.25 mole Ca
1.5 x 1023 atoms Ca

14. 86.2 grams C2H4. How many moles of C2H4? How many molecules?
Example 3:
86.2 grams C2H4. How many moles of C2H4? How many molecules?
3.08 moles C2H4
1.85 x 1024 molecules C2H4

15. 1.26 moles of NbI5. How many grams?
Example 4:
1.26 moles of NbI5. How many grams?
g NbI5

16. 5 grams of H2O to molecules of H2O
Example 5:
5 grams of H2O to molecules of H2O
1.67 x 1023 molecules H2O

17. Practice
Mole Conversion Worksheet