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HOMEWORK 9.2 STOICHIOMETRY

a. Review your notes.

b. Answer the following:

1. Citric acid, H₃C₆H₅O₇, is a product of the fermentation of sucrose, C₁₂H₂₂O₁₁ in air:

C₁₂H₂₂O₁₁ (aq) + 3O₂ (g) → 2H₃C₆H₅O₇ (aq) + 3H₂O (l)

Determine the mass (g) of citric acid produced when 2.50 moles of sucrose is used.

2. A solution of potassium chromate reacts with a solution of lead (II) nitrate to produce a yellow precipitate of lead (II) chromate and a solution of potassium nitrate:

K₂CrO₄ (aq) + Pb(NO₃)₂ (aq) → PbCrO₄ (s) + 2KNO₃ (aq)

Determine the mass (g) of PbCrO₄ produced when 0.250 moles K₂CrO₄ reacts.

3. One in a series of reactions that inflate air bags in automobiles is the decomposition of sodium azide, NaN₃:

2NaN₃ (s) → 2Na (s) + 3N₂ (g)

Determine the mass (g) of N₂ produced if 100.0moles of NaN₃ decomposes.

4. In the formation of acid rain, sulfur dioxide reacts with oxygen and water in the air to form sulfuric acid:

2SO₂ (g) + O₂ (g) + H₂O (l) → 2H₂SO₄ (aq)

Determine the mass (g) of sulfuric acid formed when 2.50 moles of sulfur dioxide react.

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