Unit 5 Stoichiometry Review

What is the molar mass of table salt (NaCl)?

• 116.89 g/mol

• 35.45 g/mol

• 22.99 g/mol

• 58.44 g/mol

N₂ +  3H₂ → 2NH₃ 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6
• 2
• 3
• 1

In the equation 2 Al₂O₃ --> 4 Al + 3 O₂, what is the mole ratio of aluminum to oxygen (aluminum is asked for, oxygen is given)?

• 10/6

• 3/4

• 4/3

• 2/3

2NaClO₃ (s) → 2NaCl (s) + 3O₂ (g)

12.00 moles of NaClO₃ will produce how many grams of O₂?

NaClO₃ = 106.44 g/mol ; O₂ = 32.00 g/mol

• 256 g of O₂

• 576 g of O₂

• 288 g of O₂

• 384 g of O₂

How many particles are in a mole?

• 602
• 602 million
• 602 moles
• 6.02 x 10²³

1 mole of any gas at STP has a volume of ______________________. 

• 22.4 liters
• 44.2 liters
• 6.02 x 10²³ liters
• 2.4 liters

Balance this reaction: ____ RbNO₃ + ____ BeF₂ ----> ____ Be(NO₃)₂ + ____ RbF

• 1,1,1,1
• 1,2,1,1
• 2,1,1,2
• 2,1,2,1

In a chemical reaction, the mass of reactants ___.

• is less than the mass of products

• is greater than the mass of products

• has no relationship to the mass of products

• is equal to the mass of products

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
• actual yield