Stoichiometry

Stoichiometry

Answer the molar conversion problems on your page

Stoichiometry

• Composition- deals with the mass relationships of elements in compounds.

• Reaction- Involves the mass relationships between reactants and products in a chemical reaction

Stoichiometry

• Type 1: Given and unknown quantities are amounts in moles. Amount of given substance(mol) to amount of unkwown substance(mol)

• Type 2: Given is an amount in moles, and unknown is a mass that is often expressed in grams. Amount of given substance(mol) to amount of unknown substance(mol) to mass of unknown substance(g)

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Stoichiometry

• Type 3: Given is a mass in grams, and unkown is an amount in moles. Mass of given substance(g) to amount of given substance(mol) to amount of unknown substance(mol)

• Type 4: Given is a mass in grams, and unkwown is a mass in grams. mass of given substance(g) to amount of given substance(mol) to amount of unknown substance(mol) to mass of unknown substance(g)

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Stoichiometry

• A mole ratio is a conversion factor that relates the amounts in moles of any two substances involved in a chemical reaction

• 4 mol Al/ 2 mol Al₂O₃

Sample

• In a spacecraft, the carbon dioxide exhaled by astronauts can be removed by its reaction with lithium hydroxide, LiOH, according to the following chemical equation.

• CO₂ (g)+ 2LiOH(s) --> Li₂CO₃(s) + H₂O(l)

• How many moles of lithium hydroxide are required to react with 20 mol CO₂, the average amount exhaled by a person each day?

Multiple Choice

Ammonia , NH₃, is widely used as a fertilizer and as an ingredient in many household cleaners. How many moles of ammonia are produce when 6 mol of hydrogen gas reacts with an excess of nitrogen gas? Write a balanced equation first.

• 4 mol NH₃

• 6 mol NH₃

• 9 mol NH₃

• 3 mol NH₃

Sample- gram to gram

• In photosynthesis, plants use energy from the sun to produce glucose, C₆H₁₂O₆, and oxygen from the reaction of carbon dioxide and water.

• What mass, in grams, of glucose is produced when 3 mol of water reacts with carbon dioxide?

Multiple Choice

What mass of Carbon Dioxide, in grams, is needed to react with 3.00 mol H₂O in the photosynthetic reaction described in Sample Problem B?

• 44

• 120

• 40

• 132