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Sagot :
When 20. 0 g NH₃ and 50. 0 g O₂ are allowed to react, NH₃ is the limiting reagent.
What is limiting reagent ?
Limiting reagent is defined as that reactant in a chemical reaction which is completely consumed in reaction.
Given,
Mass of NH₃ = 20 g
Mass of O₂ = 50 g
Molecular mass of NH₃ = 14 + 7 = 17 g
Molecular mass of O₂ = 2 × 16 = 32 g
Mole = given mass/ molecular mass
Mole of ammonia = 20/17
= 1.17 mole
Moles of O2 = 50/32
= 1.56 mole
Chemical equation:
4NH₃(g) + 3O₂(g) ⟶ 2N₂(g) +6H₂O
From above reaction it is clear that 4 moles of NH₃ react with 3 moles of oxygen.
So, 1 mole of ammonia react with = 3/4 moles of O₂
= 0.75 moles of O₂
Also, 1.18 moles of ammonia react with
= 1.18 × 0.75
= 0.885 moles of O₂
Thus, from above we concluded that ammonia is completely consumed in reaction. Therefore ammonia is limiting reagent.
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