Mole Concept & Avogadro's Number Quiz

Calculate the molar mass of H2O (water).

• 18 g/mol

• 22 g/mol

• 20 g/mol

• 16 g/mol

What is the molar relationship between grams and moles?

• moles = grams / molar mass

• moles = grams * molar mass

• moles = grams - molar mass

• moles = grams + molar mass

Calculate the number of moles in 25 grams of NaCl.

• 0.312

• 0.625

• 0.753

• 0.428

What is the volume of 1 mole of gas at STP?

• 20.4 L

• 22.4 L

• 25.4 L

• 24.4 L

Calculate the molar mass of CO2 (carbon dioxide).

• 50.01 g/mol

• 28.01 g/mol

• 44.01 g/mol

• 36.01 g/mol

What is the percent composition of oxygen in H2O?

• 80.12%

• 65.43%

• 88.81%

• 72.36%

Calculate the mass of 2 moles of CaCO3.

• 250.36 g

• 200.18 g

• 100.09 g

• 150.27 g

Calculate the number of molecules in 3 moles of CO2.

• 9.812 x 10^22 molecules

• 2.405 x 10^24 molecules

• 3.506 x 10^23 molecules

• 1.8066 x 10^24 molecules

What is the molar mass of NaCl?

• 36.45 g/mol

• 63.55 g/mol

• 40.08 g/mol

• 58.44 g/mol