Understanding the Mole Concept

What is Avogadro's number?

• 6.022 x 10^22

• 3.014 x 10^23

• 6.022 x 10^23

• 1.602 x 10^24

How many particles are in one mole of a substance?

• 1.2 x 10^24

• 6.022 x 10^23

• 3.14 x 10^22

• 5.67 x 10^23

Calculate the molar mass of water (H2O).

• 16.00 g/mol

• 18.02 g/mol

• 22.99 g/mol

• 20.18 g/mol

If you have 2 moles of sodium chloride (NaCl), what is its mass?

• 116.88 g

• 73.00 g

• 58.44 g

• 100.00 g

Convert 10 grams of carbon (C) to moles. (Molar mass of C = 12 g/mol)

• 1.2 moles

• 0.8333 moles

• 2.0 moles

• 0.5 moles

How many moles are in 50 grams of glucose (C6H12O6)? (Molar mass = 180 g/mol)

• 0.2778 moles

• 0.1 moles

• 1.0 moles

• 0.5 moles

What is the relationship between moles and molecules?

• One mole equals 1,000 molecules.

• One mole is the same as one molecule.

• One mole contains 6.022 x 10^24 molecules.

• One mole equals 6.022 x 10^23 molecules.

If 1 mole of a gas occupies 22.4 liters at STP, how many liters does 3 moles occupy?

• 33.6 liters

• 44.8 liters

• 22.4 liters

• 67.2 liters

Calculate the number of moles in 75 grams of calcium carbonate (CaCO3). (Molar mass = 100 g/mol)

• 1.5 moles

• 0.75 moles

• 0.25 moles

• 2 moles

What is the mass of 0.5 moles of potassium (K)? (Molar mass = 39 g/mol)

• 19.5 g

• 39 g

• 0.5 g

• 19 g