Atoms, molecules and stoichiometry

You will be able to

• Calculate an empirical formula from combustion data, percentage composition or masses.
• Calculate a molecular formula from an empirical formula and the relative molecular mass.
• Calculate the number of molecules of water of crystallisation in a hydrated salt from masses.

You will be able to

• Calculate amounts in mol from masses, gas volumes and solution volumes with concentrations.
• Identify the limiting reagent by comparing amount ÷ coefficient, and calculate the excess left over.
• Calculate the theoretical mass or gas volume of a product and the actual amount from a percentage yield.