The type of stoichiometric calculation that does not require the use molar mass is a limiting reactant calculation.

Limiting reactant calculations requires only 2 key information from the reaction:

- the balanced equation

- the provided amount of reactants

Based on these 2 information, we can determine which reactant is completely used up (limiting reactant) and which reactant is in excess.

Therefore, the molar mass of the reactants or products is not required for this type of stoichiometric calculation.