Limiting reagent

Limiting reagent:-which left out reaction first in terms of concentration HOW TO IDENTIFY LIMITING REAGENT AND EXCESS REAGENT IN A REACTION? Ans:-IN QUESTION WEIGHT OF REACTANTS AND PRODUCTS ARE BEEN GIVEN TO YOU FIRST:-balance the reaction SECOND:-Find out moles of reactants and products by formula NUMBER OF MOLES=GIVEN MASS/MOLECULAR MASS THIRD:-divide no of moles/stoichiometric coefficient after solving which is less in all is limiting reagent and which is greater is excess reagent suppose reaction=2A+2B----2AB(WHERE moles of A=2,B=4,AB=6) HERE REACTION IS BALANCE STOICHIOMETRIC COEFFICIENT OF A=2,B=2,AB=2 Then MOLE OF A/STOICHIOMETRIC COEFFICIENT =2/2=1 SAME B=4/2=2 Same AB=6/2=3 Here limiting reagent is A where excess is AB