Question

4 moles of hydrogen reacts with 5 moles of oxygen to form water identify excess reagent

Answer 1

A limiting reagent is a reactant that is totally consumed in a chemical reaction. The limiting reagent, as its name implies, limits the amount of product produced during the reaction. For example, let's take a look at the following reaction in which hydrogen and oxygen react to form water:

                     $2H_ 2 + O_2 => 2H_2O$