1. Representative Particles & parts to Mole Conversions
Unit 8: The Mole
Representative Particles & parts to Mole Conversions

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

3. 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. What is a mole? What is a mole? A mole is simply a unit of measure.
1 mole of a substance = the molar mass of the substance
1 mole of a substance = 6.02 x 1023 particles of that substance
What is a mole?

5. 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
You mean I REALLY still have to know the different kinds of compounds?!?

6. 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

7. Identifying Types of Particles:
Substance
Type of Particle:
Sodium chloride
oxygen
Lithium phosphate
Dinitrogen pentaoxide
Gallium
Sulfur dioxide
Phosphorus trichloride
Potassium

8. 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

9. Complete the following problems on the notes sheet we gave you.
Practice Problems
Complete the following problems on the notes sheet we gave you.

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

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

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

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

14. 1 step: Mol to mass conversions
Unit 8: The Mole
1 step: Mol to mass conversions

15. What is the mass in mole to mass conversions?
The mass comes from the molar mass of the element or compound.

16. How to do 1 step mass to mol conversions:
1. find the molar mass of the substance…
You will need this to complete the problem.
2. Solve using dimensional analysis.
Remember identical units must be opposite of each other, so they can be cross cancelled.
How many moles in 56.71g of water (H2O)?
56.71g H2O 1 mol H2O = x 1 = mols H2O
18g H2O
*Remember the molar mass of H2O is 18g/mol.
(2 hydrogen atoms x 1 AMU + 1 oxygen atom x 16 AMU) = 18 g/mol

17. PRACTICE PROBLEMS

18. How many grams in 1.56 moles of Calcium Chloride?

19. How many grams can be found in 12.8 moles of Copper (II) Phosphate?

20. How many moles are in 15.6g of sulfur dioxide?

21. How many moles can be found in 456g of lithium carbonate?

22. How many mols of sodium is 3g?

23. How many mols of Fe is .05g?

24. How many mols of Beryllium is 1.60g?