Consider the generic chemical equation:
A + B ⟶ C
Suppose 25 g of A were allowed to react with 8 g of B. Analysis of the final mixture showed that A was completely used up and 4 g of B remained. What was the limiting reactant?
Solution 12Q
A is the limiting reactant - it is all consumed
B is in excess - there is still some B left over when all of A has been used up