Stoichiometry Review

___KNO₃ → ___KNO₂ + ___O₂

What coefficients are needed to balance the reaction?

• 2, 2, 1

• 2, 3, 2

• 1, 2, 2

• 1, 3, 1

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from  6 moles H₂? 

• 4 moles Fe
• 6 moles Fe
• 9 moles Fe
• 2 moles Fe

In the equation 2Al₂O₃ → 4Al + 3O₂, what is the mole ratio of aluminum to oxygen?

• 10:6

• 3:4

• 4:3

• 2:3

What is the mole ratio of H₂O to H₃PO₄ in the following chemical equation? P₄O₁₀ + 6 H₂O → 4 H₃PO₄

• 6:4

• 4:6

• 1:3

• 3:1

Mole ratios are obtained from the

• balanced chemical equation
• periodic table
• molar mass

When does a chemical reaction stop?

• When the lab is finished
• When the excess reactant is used up
• When the limiting reactant is used up
• Chemical reactions never stop

What is a Limiting Reactant?

• the amount you end with

• the chemical you run out of first

• the unreacted chemical you have left over

• the amount you start with

What is the measured amount of a product obtained from a chemical reaction?

• mole ratio

• theoretical yield

• percentage yield

• actual yield

What is the calculated/predicted amount of product that could be obtained in a chemical reaction?

• theoretical yield

• mole ratio

• actual yield

• percentage yield

What is Avogadro's number?

• 6.02 x 10²³

• 1 mole

• 600 million

• 6.02