Find the excess reactant and leftover amount.
Finding the limiting reactant for Excess Reactant compares what each reactant demands of the other; the one that falls short is the limit, and the other leaves excess behind. The limiting reactant determines the maximum product, so it is the bottleneck of every yield calculation.
Excess Reactant
Compare reactant 2 needed (r1 x ratio) against reactant 2 available
Compare reactant 2 needed (r1 x ratio) against reactant 2 available Finding the limiting reactant for Excess Reactant compares what each reactant demands of the other; the one that falls short is the limit, and the other leaves excess behind.
The limiting reactant determines the maximum product, so it is the bottleneck of every yield calculation.
This calculator takes 3 inputs: Reactant 1 moles, Reactant 2 moles, Stoichiometric ratio. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.