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NEET CHEMISTRYMedium

4NH₃ + 5O₂ → 6H₂O + 4NO When 1 mole of ammonia (NH₃) reacts with 1 mole of oxygen (O₂), which of the following outcomes occurs regarding the consumption of the reactants?

A

Oxygen is completely consumed.

B

Ammonia is completely consumed.

C

Both oxygen (O₂) and ammonia (NH₃) are completely consumed.

D

Neither oxygen (O₂) nor ammonia (NH₃) is completely consumed.

Step-by-Step Solution

  1. Analyze Stoichiometry: From the balanced chemical equation, 4 mol of NH34\text{ mol of NH}_3 require 5 mol of O25\text{ mol of O}_2 to react completely.
  2. Calculate Required Amounts:
  • For 1 mol of NH31\text{ mol of NH}_3, the required amount of O2O_2 is 54×1=1.25 mol\frac{5}{4} \times 1 = 1.25\text{ mol}.
  1. Compare with Given Amounts:
  • We are given only 1 mol of O21\text{ mol of O}_2, which is less than the required 1.25 mol1.25\text{ mol}.
  • Therefore, Oxygen (O2O_2) is the limiting reagent and will be completely consumed before the ammonia is used up.
  1. Check Excess Reagent:
  • Amount of NH3NH_3 consumed for 1 mol O21\text{ mol O}_2 = 45×1=0.8 mol\frac{4}{5} \times 1 = 0.8\text{ mol}.
  • Remaining NH3NH_3 = 1−0.8=0.2 mol1 - 0.8 = 0.2\text{ mol}. Thus, ammonia is in excess.
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