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.

THE MOLE CONCEPT |
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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 |

PROBLEMS:Formula Masses Calculations Gram/Mole Calculation Molar Volume Calculations Percent Composition Calculations Empirical and Molecular Formulae Molarity Calculation Dilution Calculation |