Mole Concept Quiz

What is Avogadro's number?

• 10^23

• 3.1416

• 5.678 x 10^23

• 6.022 x 10^23

How many atoms are present in one mole of a substance?

• 1,000

• 100

• 10

• 6.022 x 10^23

Define molar mass.

• The weight of one molecule of a substance

• The mass of one gram of a substance

• The volume of one mole of a substance

• The mass of one mole of a substance.

What is the unit of molar mass?

• cm/s

• kg/m

• lbs/ft

• g/mol

Explain the concept of mole.

• A unit of measurement used in chemistry to express amounts of a chemical substance.

• A small animal that burrows underground

• A type of spicy Mexican sauce

• A type of skin blemish

How is Avogadro's number related to the mole concept?

• Avogadro's number is the number of atoms in one gram.

• Avogadro's number is the number of particles in one kilogram.

• Avogadro's number is the number of moles in one particle.

• Avogadro's number is the number of particles in one mole.

Calculate the molar mass of water (H2O).

• 20.02 g/mol

• 22.05 g/mol

• 18.02 g/mol

• 16.04 g/mol

Answer explanation

The molar mass of water (H2O) is 18.02 g/mol. This is the correct choice because it represents the average mass of one mole of water molecules.

What is the relationship between the mass of a substance and the number of moles?

• It is determined by the substance's color.

• It is determined by the substance's boiling point.

• It is determined by the substance's density.

• It is determined by the substance's molar mass.

How is the mole concept used in stoichiometry?

• By measuring the volume of a substance and the number of moles

• By counting the number of atoms in a substance

• By converting between the mass of a substance and the number of moles

• By determining the color of a substance and the number of moles

Explain the difference between molecular mass and molar mass.

• Molecular mass is the mass of a single molecule, while molar mass is the mass of one atom.

• Molecular mass is the mass of one mole of a substance, while molar mass is the mass of a single molecule.

• Molecular mass is the mass of a single molecule, while molar mass is the mass of one mole of a substance.

• Molecular mass is the mass of a single atom, while molar mass is the mass of one mole of a substance.