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Chemistry Unit 1.2: Formulae, Equations and Moles
Equations and Moles
Empirical and Molecular Formulae
The empirical formula of a compound tells us the simplest ratio of atoms in that compound. It is
found from experimental data.
Question
A hydrocarbon was found to contain 75% carbon and 25% hydrogen by mass.…

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5. Formula =

Full and Ionic Equations
A fully balanced equation or stoichiometric equation is one that shows the formulae of reactants and
products and the relative number of particles reacting. e.g.


An ionic equation is one where the ions are represented separately. Only ionic compounds can be
represented as…

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Moles of CaCO3 = Mass/r.f.m = 10/100 = 0.1moles

3) Work out the amount in moles of CO2:
Moles of CO2 = Moles of CaCO3 = 0.1moles

4) Work out the volume of CO2:
Volume of CO2 = Moles of CO2 x 24 = 0.1 x 24 = 2.4dm3
Gaseous…

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