Why is reaction stoichiometry important? Cite some examples in your answer.
Stoichiometry is important because it explains the relationships of reactants and products in chemical reactions. Without stoichiometry, it would be impossible to determine how much of a certain chemical is needed to yield a result or what molar amounts of each reactant and product are present in a completed reaction.
Thus stoichiometry allows us to make predictions about the outcomes of chemical reactions
For example if we are asked to find the mass of Zn required to produce 11.2 litres of H2 we can easily predict it with the help of the reaction given below
Zn +H2SO4--------->ZnSO4 +H2
Since from the stoichiometry we know 1 mole or 65 grams of Zn gives 1 mole or 22.4 litres of H2,
Thus the mass of Zn required to produce 11.2 litres will be =32.5 grams