Percent Yield Calculations in Chemical Reactions

Look at the reaction equation below:

You might recognize it as a balanced equation for the combustion reaction of gasoline. If 228g of gasoline were combusted, how much carbon dioxide would be produced? If you calculated that 704g of carbon dioxide would be produced, that would be the correct theoretical yield, or the yield that you would, in theory, get if the reaction went on perfectly. However, since nothing is perfect, the actual yield could be considerably less (never more!).