Once it is understood that reaction equations are mole-mole relations, it is possible to use this idea to do stoichiometric calculations. However, to do so the concept of mole-moleconversion factors must be clearly understood. Consider the reaction of chromium(III) hydroxide with sulfuric acid:
We can state relations in this equation both verbally and with a conversion factor in many ways:
Obviously, there are several more relations about this reaction that could be made however, the above should suffice is showing how these mole conversion factors are constructed. We can now use these mole conversion factors to do the stoichiometric calculations.