Stoichiometry Practice Problems
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Questions and Answers

How many moles of H2 would be required to produce 5.0 moles of water?

5.0 moles

What mass of H2O is formed when excess H2 reacts with 384 g of O2?

432 grams

What mass of H2SO4 would be required to react with 0.75 mol of NaOH?

36.8 grams

If 30.0 g of H2SO4 reacts with sodium hydroxide, what mass of water is produced?

<p>11.0 grams</p> Signup and view all the answers

How many grams of SnF2 are produced from the reaction of 30.0 g of HF?

<p>117 grams</p> Signup and view all the answers

How many moles of HF will be needed to react with 48 grams of Tin, Sn?

<p>0.81 moles</p> Signup and view all the answers

If 20.0 moles of CO2 is exhaled, how much (in grams) Li2CO3(s) is produced?

<p>148 grams</p> Signup and view all the answers

How many moles of H2 are produced in the reaction with 5.0 grams of water?

<p>0.14 moles</p> Signup and view all the answers

How many moles of O2 are produced from 10 moles of KClO3?

<p>15 moles</p> Signup and view all the answers

If you start with 10 grams of lithium hydroxide, how many grams of lithium bromide will be produced?

<p>36.3 grams</p> Signup and view all the answers

If you start with 45 grams of ethylene (C2H4), how many grams of carbon dioxide will be produced?

<p>141.4 grams</p> Signup and view all the answers

If you start with 20 grams of hydrochloric acid (HCl), how many grams of sulfuric acid (H2SO4) will be produced?

<p>26.9 grams</p> Signup and view all the answers

If 20 grams of LiOH react, how many grams of LiCl will be produced?

<p>35.5 grams</p> Signup and view all the answers

If I start with 5 grams of C3H8, how many grams of water will be produced?

<p>8.2 grams</p> Signup and view all the answers

What mass of O2 will be needed to burn 36.1 g of B2H6?

<p>125 grams</p> Signup and view all the answers

How many moles of water are produced from 19.2 g of B2H6?

<p>1.39 moles</p> Signup and view all the answers

How many grams of KMnO4 are required for the reaction with 25.0 g of K2C2O4?

<p>9.51 grams</p> Signup and view all the answers

How many grams of Mn(OH)2 will be produced when 25.0 g of K2C2O4 is reacted?

<p>5.35 grams</p> Signup and view all the answers

How many moles of O2 are required to react completely with 2.00 moles of H2?

<p>1 mole</p> Signup and view all the answers

How many moles of H2O are produced after complete reaction of 2.00 moles of H2?

<p>2 moles</p> Signup and view all the answers

How many moles of O2 are required to react completely with 3.00 moles of NH3?

<p>3 moles</p> Signup and view all the answers

How many moles of H2O are produced after complete reaction of 3.00 moles of NH3?

<p>4.5 moles</p> Signup and view all the answers

How many moles of N2O are produced after complete reaction of 3.00 moles of NH3?

<p>1.5 moles</p> Signup and view all the answers

Study Notes

Stoichiometry Practice Problems

  • Water Formation from Hydrogen and Oxygen

    • Reaction: 2H2 + O2 → 2H2O
    • To produce 5.0 moles of water, 5.0 moles of H2 are required.

  • Mass of Water from Oxygen

    • Given 384 g of O2, the mass of water (H2O) formed is 432 grams.

Sulfuric Acid and Sodium Hydroxide Reactions

  • H2SO4 and NaOH Reaction

    • Reaction: H2SO4 + 2NaOH → Na2SO4 + 2H2O
    • 36.8 grams of H2SO4 are needed to react with 0.75 mol of NaOH.

  • Water Production from H2SO4

    • When 30.0 g of H2SO4 reacts with NaOH, it produces 11.0 grams of water.

Tin and Hydrofluoric Acid Reactions

  • Sn and HF Reaction

    • Reaction: Sn + 2HF → SnF2 + H2
    • 30.0 g of HF produces 117 grams of SnF2.

  • HF Requirement for Tin

    • 48 grams of Tin (Sn) requires 0.81 moles of HF for reaction.

Carbon Dioxide Removal in Spacecraft

  • Reaction with Lithium Hydroxide
    • Reaction: CO2(g) + 2LiOH(s) → Li2CO3(s) + H2O(l)
    • 20.0 moles of exhaled CO2 produce 148 grams of Li2CO3.

Sodium Reaction with Water

  • Sodium and Water Reaction
    • Reaction: 2Na + 2H2O → 2NaOH + H2
    • 5.0 grams of water yields 0.14 moles of H2.

Decomposition of Potassium Chlorate

  • KClO3 Decomposition Reaction
    • Reaction: 2KClO3 → 2KCl + 3O2
    • 10 moles of KClO3 produces 15 moles of O2.

Lithium Hydroxide and Hydrobromic Acid Reaction

  • LiOH and HBr Interaction
    • Reaction: LiOH + HBr → LiBr + H2O
    • 10 grams of lithium hydroxide produces 36.3 grams of lithium bromide.

Combustion of Ethylene

  • Ethylene and Oxygen Reaction
    • Reaction: C2H4 + 3 O2 → 2 CO2 + 2 H2O
    • Starting with 45 grams of ethylene produces 141.4 grams of carbon dioxide.

Hydrochloric Acid and Sulfuric Acid Reaction

  • HCl Reaction with Na2SO4
    • Reaction: 2HCl + Na2SO4 → 2 NaCl + H2SO4
    • 20 grams of hydrochloric acid produces 26.9 grams of sulfuric acid.

Lithium Hydroxide and Potassium Chloride Reaction

  • LiOH and KCl Reaction
    • Reaction: LiOH + KCl → LiCl + KOH
    • 20 grams of LiOH yields 35.5 grams of LiCl.

Combustion of Propane

  • Propane and Oxygen Reaction
    • Reaction: C3H8 + 5 O2 → 3 CO2 + 4 H2O
    • 5 grams of propane results in 8.2 grams of water.

Boron Hydride and Oxygen Reaction

  • B2H6 Combustion

    • Reaction: B2H6 + O2 → HBO2 + H2O
    • 36.1 g of B2H6 requires 125 grams of O2 for complete combustion.

  • Moles of Water Produced from B2H6

    • 19.2 g of B2H6 produces 1.39 moles of water.

Reaction Quantities in Potassium Oxalate

  • Potassium Oxalate Reaction

    • Reaction: 5 K2C2O4 + 2 KMnO4 + 8 H2O → 10 CO2 + 2 Mn(OH)2 + 12 KOH
    • For 25.0 g of K2C2O4, 9.51 grams of KMnO4 are needed.

  • Mn(OH)2 Production

    • From the same amount of K2C2O4, 5.35 grams of Mn(OH)2 are produced.

Molar Relationships in Reactions with Hydrogen

  • Hydrogen Reaction Requirements
    • 2H2 + O2 → 2H2O: To react completely with 2.00 moles of H2, 1 mole of O2 is needed.
    • The complete reaction of 2.00 moles of H2 results in 2 moles of H2O.

Ammonia Reactions

  • Ammonia with Oxygen Reaction
    • Reaction: 2NH3 + 2O2 → N2O + 3H2O
    • 3.00 moles of NH3 require 3 moles of O2 and yield 4.5 moles of H2O.
    • This reaction also produces 1.5 moles of N2O.

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Test your skills with these stoichiometry practice problems. This quiz covers calculations involving chemical reactions, including mole and mass conversions. Perfect for students studying chemistry principles.

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