Practice Mole Calculations

What is the Molecular mass of MgCl₂?

• 98 g / mol

• 94 g / mol

• 37 g / mole

• 107 g / mol

How many moles are in 22 grams of argon? 

• 0.10 moles

• 15 moles

• 0.55 moles

• 12 moles

What is the formula mass of H₃PO₄    ?

• 127 g/mol

• 15 g/mol

• 91 g/mol

• 98 g/ mol

How many moles are in 9.8 grams of calcium? 

• 0.245 moles

• 9.06 moles

• 15 moles

• 0.17 moles

How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)₃?

• 1.26 moles

• 1.70 moles

• 37 moles

• 9.8 moles