1. Representative Particles & parts to Mole Conversions
Unit 9: The Mole
Representative Particles & parts to Mole Conversions

2. Review: What is a mole? How many are in: A pair? Dozen? Gross? Ream?
What do these represent?

3. Review: What is a mole? 1 mole = 6.02 x 1023 particles
Particles are representative units: (atoms, formula units, molecules)
This number is known as Avogadro's Number
It is the number of particles whatever they may be: atoms, formula units, molecules
Examples:
1. If I have a mole of apples, how many apples do I have?
2. A mole of marbles?
3. A mole of skittles?

4. Avogadro’s Number and Representative Particles/Units
1 mole = 6.02 x 1023 ___units/particles____
The units/particles depends on what type of particle it is:
Atoms (atms): individual elements
Formula Units (FU): Ionic Compounds
Molecules (molec): Covalent Compounds

5. Representative Particles:
Atoms (atms): individual elements
These are individual elements
H2, Cu, Na, Cl2
Formula Units (FU): Ionic Compounds
These are compounds that begin with a cation, or metal.
NaCl, CaCl2, AgNO3
Molecules (molec): Covalent Compounds
These are compounds that begin with a nonmetal
CO, H2O, N2O, AsC4

6. Identifying Types of Particles:
Substance
Formula for substance:
Unit/Particle
Sodium chloride
oxygen
Lithium phosphate
Dinitrogen pentaoxide
Gallium
Sulfur dioxide
Phosphorus trichloride
Potassium

7. Converting particles (parts) to moles:
How many atoms are in 2.54 moles of sulfur.
Given Unit_Conversion Factor_(New Unit)
Conversion Factor (given unit)
What is our conversion factor?
6.02 x 1023 particles (atoms, molecules, formula units)
2.54 𝑚𝑜𝑙𝑠 𝑆 𝑥 𝑥 𝑎𝑡𝑚𝑠 𝑆 1 𝑚𝑜𝑙 𝑆 = 1.53 x 1023 atms S

8. Complete the following problems in your notes.
Practice Problems
Complete the following problems in your notes.

9. How many atoms are in 6.2 moles of Al?

10. Convert 5.75 x 1024 atoms of Al into mols of Al.

11. How may atoms are in 3.5 moles of Si?

12. Convert 5.3 x 1025 molecules of CO2 to moles.

13. What does Avogadro put in his hot chocolate?
Marsh-mole-ows!