Question

Is determining the excess reactant and limiting reactant an important part of a synthesis reaction? Is it an important part of a decomposition reaction? Explain.

Answer 1

In a synthesis rxn. you have two reactants determining the limiting reactant is important.

but conversely a decomposition rxn. there is only one reactant so, --finding a limiting reactant does not apply.

Answer 2

If you write examples, you'll notice that a synthesis reaction involves at least 2 reactants, while a decomposition involves only one. So, in short, yes you do need to consider the limiting reactant in a synthetic process, but not in a decomposition reaction because there is only one reactant.

Answer 3

In a synthesis reaction where we have 2 or more reagents, finding the limiting reagent is important, as the amount of this substance present will directly determine the amount of product we are able to form from the reaction.

In a decomposition reaction, this is not relevant as we only have 1 single reagent, which breaks down to form the products. Therefore, we cannot really define the reagents to be 'limiting' or 'in excess' in this case.