1. The Mole AA. Review
Must turn in your packet with notes stapled to it before you can take the test

2. Define (*and how to calculate)
Molar Mass*
Mole*
Mass in grams of 1 mole of any pure substance.
Add individual masses from PT
SI base unit used to measure amount of substance
Use conversion ratios btw molar mass and representative particles

3. Define (*and how to calculate)
Empirical Formula*
Molecular Formula*
Formula that shows lowest, whole # mole ratio
Find moles, divide by smallest, multiple ‘til whole number ratios
- Formula that shows all atoms in a molecule
- Divide MF mass by EF mass, multiply EF by the whole number answer.

4. Define (*and how to calculate)
Percent Composition*
Representative Particles (are they atoms, molecules, or formula units?)*
- Percent by mass of each element in a compound.
- Find molar mass, divide individual masses by molar mass, times by 100.
Element = atoms
Covalent Compound = molecule
Ionic Compound = formula unit
* Convert with Avogador’s #

5. Define (*and how to calculate)
7. Avogadro’s Number
# of representative particles in a mole
1 mole = 6.02 x 1023

6. 8. Determine the molar mass of the following:
Oxygen
Nitrogen dioxide
c. NH4NO3
O2 = 2 (16.00) = g/mol
NO2 = 1(14.01) + 2(16.00) = g/mol
NH4NO3 = 1(14.01) + 4(1.01) + 1(14.01) + 3(16.00) = g/mol

7. 9. Convert the following:
a moles of carbon monoxide to grams

8. 9. Convert the following:
b g of chlorine gas (Cl2) to moles

9. 9. Convert the following:
c  1024 molecules of (NH4)SO3 to moles

10. 10. Convert the following:
20.6 moles of SO2 to grams

11. 10. Convert the following:
b g of iron (II) oxide to molecules

12. 10. Convert the following:
c x 1024 molecules of N2 to moles

13. 11.
Determine the percent composition of CuSO4

14. 12. Determine the empirical formula of a sample that has: 21
12. Determine the empirical formula of a sample that has: 21.6% sodium (Na), 33.3% chlorine (Cl), and 45.1% oxygen (O)

15. 13. Determine the molecular formula of the following compound: Nitrogen = 30.4%, Oxygen=69.6%. Molecular weight = 92 g/mol