Question

what are limiting and excess reactants?

Answer 1

In a rxn, the reactant molecules which are completely consumed are called limitting reagents,

Those molecules which are present in excess even after the completion of rxn are called excess reagent

Answer 2

$\textbf{Limiting Reactant }$

$\textbf{OR}$

$\textbf{Limited Reagent }$:

The reactant which is completely consumed when a reaction goes to completion is called the limiting reagent.

$\textbf{Excess Reagent }$:

Other reactants present in quantities greater than those needed to react with the quantity of the limiting reagent present would be left untreated. It is also called excess reagent.