Holt Ch 9 PPT

Open Ended

How would you convert from moles of substances to masses?

Open Ended

Explain the difference between composition stoichiometry and reaction stoichiometry.

Multiple Choice

Which type of stoichiometry deals with the mass relationships of elements in compounds?

• Composition stoichiometry

• Reaction stoichiometry

• Empirical stoichiometry

• Molecular stoichiometry

Open Ended

Describe the four types of reaction stoichiometry problems and how the given and unknown quantities differ in each type.

Multiple Choice

Which of the following is a correct mole ratio from the reaction 2Al2O3(l) → 4Al(s) + 3O2(g)?

• 2 mol Al2O3 / 4 mol Al

• 4 mol Al / 3 mol O2

• 2 mol Al2O3 / 3 mol O2

• All of the above

Multiple Select

Which of the following are correct steps for converting between amounts in moles, as described in the slides?

• Identify the amount in moles you know from the problem

• Set up the mole ratio using coefficients from the balanced equation

• Multiply the original amount by the mole ratio

• Add the coefficients of all substances involved

Multiple Choice

Which step in the mass-mass stoichiometry problem-solving process involves using the mole ratio from the balanced equation?

• Converting mass of substance given to moles

• Using the mole ratio from the balanced equation

• Converting moles of substance sought to mass

• Identifying the mass of substance given

Multiple Select

Which of the following can be determined using stoichiometric calculations?

• The amount in moles of a product from the amount in moles of a reactant

• The mass of a reactant from the amount in moles of a product

• The amount in moles of a reactant from the mass of a product

• All of the above

Multiple Choice

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

• 10 mol

• 20 mol

• 30 mol

• 40 mol

Open Ended

Describe how the mole ratio from a balanced equation is used in stoichiometric calculations.

Multiple Choice

Which of the following is the correct conversion factor to use when converting from the amount of a given substance in moles to the amount of an unknown substance in moles?

• Mole ratio from the balanced equation

• Molar mass of the given substance

• Density of the unknown substance

• Volume of the given substance

Multiple Select

Which of the following are necessary conversion factors when converting from moles of a given substance to grams of an unknown substance?

• Mole ratio from balanced equation

• Molar mass of unknown substance

• Volume of the solution

• Avogadro's number

Open Ended

Explain the importance of using a balanced chemical equation when performing stoichiometric calculations involving moles and mass.

Multiple Choice

What mass, in grams, of glucose is produced when 3.00 mol of water react with carbon dioxide?

• 54.0 g

• 180 g

• 90.0 g

• 36.0 g

Multiple Choice

What is the mass of C6H12O6 produced when 3.00 mol of H2O reacts according to the equation 6CO2(g) + 6H2O(l) → C6H12O6(s) + 6O2(g)?

• 90.1 g

• 54.0 g

• 180.2 g

• 15.0 g

Open Ended

Explain the steps involved in converting the mass of a given substance to the amount in moles of an unknown substance using stoichiometry.

Open Ended

a. How many moles of NO are formed when 824 g of NH3 reacts with excess oxygen? b. How many moles of H2O are formed?

Open Ended

After learning about stoichiometry, what is one real-world application where you think stoichiometry would be important?

Multiple Choice

In the reaction 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g), what is the correct sequence of conversion factors to calculate the moles of NO produced from a given mass of NH3?

• Grams NH3 → Moles NH3 → Moles NO

• Grams NH3 → Grams NO → Moles NO

• Moles NH3 → Grams NO → Moles NO

• Grams NH3 → Moles NO → Grams NO

Multiple Choice

Which of the following is NOT a conversion factor used in mass-mass stoichiometric calculations?

• Molar mass of given substance

• Mole ratio from balanced equation

• Molar mass of unknown substance

• Density of unknown substance