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
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