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For the following reaction, 513 grams of barium hydroxide are allowed to react with 98.1 grams of sulfuric acid.

Ba(OH)₂ (aq) + H₂SO₄ (aq) → BaSO₄ (s) + 2 H₂O (l)

What is the FORMULA for the limiting reagent?

Answer :

The limiting reagent for the reaction between 513 grams of barium hydroxide and 98.1 grams of sulfuric acid is sulfuric acid (H₂SO₄).

1) To identify the limiting reagent in the given reaction, we must first determine the moles of each reactant.

Starting with barium hydroxide (Ba(OH)₂):

  • Molar mass of Ba(OH)₂ = 137.33 (Ba) + 2 × 17.00 (OH)
  • = 171.33 g/mol
  • Moles of Ba(OH)₂ = 513 g / 171.33 g/mol
  • ≈ 2.99 moles

2) Next, for sulfuric acid (H₂SO₄):

  • Molar mass of H₂SO₄ = 2 × 1.01 (H) + 32.07 (S) + 4 × 16.00 (O)
  • = 98.09 g/mol
  • Moles of H₂SO₄ = 98.1 g / 98.09 g/mol
  • ≈ 1.00 moles

The balanced equation is:

Ba(OH)₂ (aq) + H₂SO₄ (aq) → BaSO₄ (s) + 2 H₂O (l)

From the balanced equation, the mole ratio of Ba(OH)₂ to H₂SO₄ is 1:1. To react with 2.99 moles of Ba(OH)₂, we would need 2.99 moles of H₂SO₄. The limiting reagent is is sulfuric acid (H₂SO₄).

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