Molar Mass, Moles, and Mass Practice

In chemistry, a "mole" is:

• The mass of an atom
• a large number used to count particles
• based on the volume of a substance

Which has more molecules?

• 1 mole H₂O
• 1 mole Al(OH)₃
• 1 mole NaCl
• There are all the same

What is the molar mass of C₂H₄O₂?

• 40g
• 50g
• 60g
• 68g

What is the molar mass of Sr(NO₃)₂?

• 211.64 g/mol

• 163.64 g/mol

• 149.63 g/mol

• 197.63 g/mol

Determine the molar mass for carbon tetrachoride (CCl₄)

• 153.823 g/mol

• 118.37 g/mol

• 189.35 g/mol

• 47.464 g/mol

What is the mass of 0.75 moles of (NH₄)₃PO₄? The molar mass of the compound is 149 grams.

• 101.75 g

• 121.75 g

• 111.75 g

• 131.75 g

What is the mass of 0.89 mol of CaCl₂? The molar mass is 110.98g/mol

• 111 grams
• 0.008 grams
• 98.9 grams
• none of the choices

How many moles are in 100.0 g of dinitrogen oxide (N₂O)? The molar mass is 44.013 g/mol.

• 2.272 mol N₂O

• 6.25 mol N₂O

• 7.14 mol N₂O

• 44.013 mol N₂O

How many moles are in 15 grams of lithium?

• 1.2 moles

• 2.1 moles

• 4.33 moles

• 6.77 moles

How many moles are there in 12.7g of CaF₂? The molar mass is 78.07 g/mol

• 0.20 mol
• 1,000.76 mol
• 6.14 mol
• 0.16 mol