The MoleAA. Review

Must turn in your packet with notes stapled to it before you

can take the test

Define (*and how to calculate)

1. Molar Mass*

2. 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

Define (*and how to calculate) 3. Empirical Formula*

4. 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.

Define (*and how to calculate)5. Percent Composition*

6. 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 #

Define (*and how to calculate)

7. Avogadro’s Number-# of representative particles in a mole-1 mole = 6.02 x 1023

8. Determine the molar mass of the following:

a. Oxygen

b. Nitrogen dioxide

c. NH4NO3

O2 = 2 (16.00) = 32.00 g/mol

NO2 = 1(14.01) + 2(16.00) = 46.01 g/mol

NH4NO3 = 1(14.01) + 4(1.01) + 1(14.01) + 3(16.00) = 80.06 g/mol

9. Convert the following: a. 4.53 moles of carbon monoxide to grams

9. Convert the following: b. 0.67 g of chlorine gas (Cl2) to moles

9. Convert the following:

c. 2.41 1024 molecules of (NH4)SO3 to moles

10. Convert the following:

a. 20.6 moles of SO2 to grams

10. Convert the following:

b. 4.44 g of iron (II) oxide to molecules

10. Convert the following:

c. 8.322 x 1024 molecules of N2 to moles

11.

Determine the percent composition of CuSO4

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

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