Stoichiometry Unit Review

Which quantity is equal to one mole of Si?

• the mass of neutrons in grams

• the number of neutrons in grams

• the atomic mass in grams

• the atomic number in grams

Which of the following quantities is equivalent to Avogadro’s number?

• the number of molecules of fluorine in 19.0 g

• the number of atoms in 44.01 g of CO₂

• the number of atoms in 16.00 g of O-16

• the number of molecules of water in 36.0 mL

What is the molar mass of Fe(NO₃)₃?

• 242 g/mol

• 214 g/mol

• 194 g/mol

• 146 g/mol

The molar mass of a compound is 48 grams. The mass of 1.0 mole of this compound is

• 480 g

• 48 g

• 4.8 g

• 1.0 g

What is the molar mass of sulfur trioxide?

• 80. g/mol

• 48 g/mol

• 32 g/mol

• 16 g/mol

Which group 1 oxide has a molar mass of 61.98 g/mol?

• Li₂O

• Na₂O

• K₂O

• Rb₂O

According to the information in the table below, a 1.00 g sample of which of the following contains the greatest mass percent of oxygen?

• Na₂O

• MgO

• K₂O

• CaO

What is the percent composition by mass of oxygen in Ca(NO₃)₂?

• 59%

• 48%

• 29%

• 9.8%

The molar mass of a compound is the

• product of the atomic masses of its atoms

• product of the atomic numbers of its atoms

• sum of the atomic masses of its atoms

• sum of the atomic numbers of its atoms

What is the formula of calcium chloride hexahydrate?

• CaCl · 7H₂O

• CaCl₂ · 7H₂O

• CaCl · 6H₂O

• CaCl₂ · 6H₂O