Question

If 4 moles of NH₃ (ammonia) and 3 moles of O₂ (oxygen gas) react in the reaction below, determine the EXCESS reactant. 4NH₃ + 5O₂ --> 4NO + 6H₂O

Answer 1

Total moles of $NH_3$ react $=4\times 4=16$

Total moles of $O_2$ reacts $= 5\times 3=15$

So Here Excess reactant is$NH_3.$