3.3 The mole and the Avogadro constant

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Syllabus Objectives

IGCSE Chemistry Revision Notes

Topic:Stoichiometry

Sub Topic:3.3 The mole and the Avogadro constant

Syllabus Objectives:

CORE:

  • State that concentration can be measured in g /dm3 or mol/dm3

EXTENDED:

  • State that the mole, mol, is the unit of amount of substance and that one mole contains 6.02 × 1023 particles, e.g. atoms, ions, molecules; this number is the Avogadro constant
  • Use the relationship amount of substance (mol) = mass (g) molar mass (g /mol) to calculate:
  • (a) amount of substance
  • (b) mass
  • (c) molar mass
  • (d) relative atomic mass or relative molecular/formula mass (
  • e) number of particles, using the value of the Avogadro constant
  • Use the molar gas volume, taken as 24dm3 at room temperature and pressure, r.t.p., in calculations involving gases
  • Calculate stoichiometric reacting masses, limiting reactants, volumes of gases at r.t.p., volumes of solutions and concentrations of solutions expressed in g /dm3 and mol/dm3 , including conversion between cm3 and dm3
  •  Use experimental data from a titration to calculate the moles of solute, or the concentration or volume of a solution
  • Calculate empirical formulae and molecular formulae, given appropriate data
  •  Calculate percentage yield, percentage composition by mass and percentage purity, given appropriate data

Revision Notes

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