Stoichiometry, LR, percent yield Regular Chem

2 NaClO₃ (s) --> 2NaCl (s) +3 O₂ (g)  
12.00 moles of NaClO₃ will produce how many grams of O₂?

• 256 g

• 288 g

• 576 g

• 18 g

CH₄ + 2 O₂ → CO₂ + 2 H₂O
How many moles of carbon dioxide are produced from the combustion of 110 g of CH₄?

• 13.7 mol
• 2.75 mol
• 6.11 mol
• 6.85 mol

2Na + 2H₂O → 2NaOH+ H₂
How many grams of hydrogen are produced if 120 g of Na are available?

• 5.2 g
• 2.6 g
• 690 g
• 45 g

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

• theoretical yield
• mole ratio
• actual yield
• percentage yield

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

• mole ratio
• theoretical yield
• percentage yield
• experimental yield

A chemist interested in determining the success of a chemical reaction would calculate the

• mole ratio
• rate of reaction
• percent yield
• molar mass

What is an Excess Reactant?

• amount you end with
• what you run out of first
• what you have left over
• what you start with

When does a chemical reaction stop?

• When the bell rings.

• When the excess reactant is used up
• When the limiting reactant is used up
• When heat is released

B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O
 What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

• 13.8 g

• 3.86 g

• 124 g

4 Al + 3 O₂ –> 2 Al₂O₃ 

How many moles of aluminum would be needed to completely react with 45 grams of O₂?

• 1.05 moles

• 3.75 moles

• 1.875 moles

• 5.625 moles