Knowing either the empirical or molecular formula of a compound, can help to determine its composition in more detail. The opposite is also true. Knowing the composition of a substance can help you to determine its formula. There are four different types of composition problems that you might come across:
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Problems where you will be given the formula of the substance and asked to calculate the percentage by massof each element in the substance.
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Problems where you will be given the percentage composition and asked to calculate the formula.
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Problems where you will be given the products of a chemical reaction and asked to calculate the formula of one of the reactants. These are often referred to as combustion analysis problems.
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Problems where you will be asked to find number of moles of waters of crystallisation.
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Physical Sciences Break 1.0 
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