Chemistry NMDCAT MCQs
Limiting and Excess Reactants
nmdcat.online
July 2, 2026
Regarding the reaction 4NH₃ + 5O₂ → 4NO + 6H₂O, if 8 moles of NH₃ and 8 moles of O₂ are mixed, the excess reactant remaining after the reaction is complete is
A.
NH₃, 1.6 moles
✓
B.
O₂, 1.6 moles
C.
NH₃, 2 moles
D.
O₂, 2 moles
📝 Explanation
8 mol O₂ require only 6.4 mol NH₃. Therefore, NH₃ remains in excess by 1.6 mol.
📖 Additional Information
NH₃, 1.6 moles
O₂, 1.6 moles
NH₃, 2 moles
O₂, 2 moles
8 mol O₂ require only 6.4 mol NH₃. Therefore, NH₃ remains in excess by 1.6 mol.
