Unit 5

On completion of the unit you should be able to:

1. write the number of particles in a mole.
2. calculate the formula (or molecular) mass of compounds.
3. solve problems involving conversions between the mass, the number of moles, the number of formula units and the volume (for gaseous substances at standard temperature and pressure).
4. given the formula of a compound calculate the percent composition.
5. given the composition of a compound calculate the empirical formula.
6. given the composition and molecular mass of a molecular compound calculate the molecular formula.
7. express solution concentration in moles/liter.
8. do calculations involving solutions which have concentrations expressed in moles/liter.
9. solve dilution calculation.

5.1 Mole concept
Reading: Hebden – page 78
5.2 Formula mass
5.3 Information in chemical formulae
5.4 From amu to gram
5.5 Molar mass
Reading: Hebden – page 79
5.6 Calculations involving Avogadro’s number
Reading: Hebden – page 81-88
5.7 Molar volume of a gas
Reading: Hebden – page 82
5.8 Percent composition of compounds
Reading: Hebden – page 90
5.9 Empirical formula
Reading: Hebden – page 91-95
5.10 Molarity and solution preparation
Reading: Hebden – page 96-98
5.11 Solution dilution
Reading: Hebden – page 99
Formula Masses Calculations
Gram/Mole Calculation
Molar Volume Calculations
Percent Composition Calculations
Empirical and Molecular Formulae
Molarity Calculation
Dilution Calculation

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