Calculating Molar Mass: Practice Problems and Techniques

What does the term 'molar mass' refer to in chemistry?

• The volume of a mole of a substance

• The mass of a mole of a chemical compound

• The density of a chemical compound

• The number of particles in a mole

How many oxygen atoms are present in the compound SO2?

• Three

• Four

• Two

• One

In the compound C3H8O, how many hydrogen atoms are there?

• Eight

• Ten

• Six

• Three

What is the total molar mass of C3H8O?

• 44.01 grams per mole

• 100.12 grams per mole

• 75.07 grams per mole

• 60.11 grams per mole

What does the '2' after the parentheses in Ca(NO3)2 indicate?

• Two NO3 groups

• Two nitrogen atoms

• Two calcium atoms

• Two oxygen atoms

How many total oxygen atoms are in Ca(NO3)2?

• Six

• Three

• Nine

• Twelve

What is the molar mass of NH4 3PO4?

• 200.20 grams per mole

• 180.15 grams per mole

• 164.10 grams per mole

• 149.12 grams per mole

In the hydrate MgSO4·7H2O, how many water molecules are included?

• Seven

• Six

• Five

• Four

What is the significance of the dot in the hydrate formula MgSO4·7H2O?

• Separates the compound from water molecules

• None of the above

• Indicates a chemical bond

• Denotes a multiplication factor

What is the total number of oxygen atoms in the hydrate MgSO4·7H2O?

• Eight

• Nine

• Ten

• Eleven