sir it would b more clear if u hd taken some examples with mole ...limiting reagent n all....sir it wld b helpful if u vl provide some questions based on limitng reagent...concept vl become more clear ..sir i wld suggest u to take more examples during ur lec...i as a student tell u that taking examples concept becomes clear....

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane