IB Chemistry Topic 1 Stoichiometric relationships Topic 1.2 The mole concept SL

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This works its way from mass to solution to gas Stoichiometry.

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0:20 Conversion of units
2:33 What is the mole?
5:40 Relative mass
7:02 Molar mass
7:19 n=m/M problems
8:24 Mass Stoichiometry problems
10:10 Percent composition
10:41 Empirical and molecular formulae

1.2 The mole concept
• The mole is a fixed number of particles and refers to the amount, n, of substance.
• Masses of atoms are compared on a scale relative to 12C and are expressed as relative atomic mass (Ar) and relative formula/molecular mass (Mr).
• Molar mass (M) has the units g mol-1.
• The empirical formula and molecular formula of a compound give the simplest ratio and the actual number of atoms present in a molecule respectively.
• Calculation of the molar masses of atoms, ions, molecules and formula units.
• Solution of problems involving the relationships between the number of particles, the amount of substance in moles and the mass in grams.
• Interconversion of the percentage composition by mass and the empirical formula.
• Determination of the molecular formula of a compound from its empirical formula and molar mass.
• Obtaining and using experimental data for deriving empirical formulas from reactions involving mass changes

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