1.5.1 The Mole Concept

• The mole is defined as the number of atoms in exactly 12 grams of carbon-12
• Mass-mole conversions use the molar mass of the substance


  True
• What is the formula to calculate the number of moles?

  n = m / Mr
• Avogadro's constant is the number of particles in 1 mole
• Avogadro's constant relates macroscopic measurements to microscopic quantities.
• The molar mass of an element is equal to its relative atomic mass


  True
• Match the term with its definition:

  Relative Atomic Mass ↔️ Mass of one atom relative to carbon-12

  Relative Molecular Mass ↔️ Mass of one molecule relative to carbon-12
• Avogadro's constant is the number of particles in 1 mole of any substance.
• To calculate the molar mass of a compound, you add the relative atomic masses of the atoms in the molecule.

  True
• How many moles are in 24 grams of carbon, if the molar mass of carbon is 12 g/mol?

  2 mol
• The formula for converting between volume and moles of a gas at STP is n = V / Vm.

  True
• The formula to convert between the volume of a gas and the number of moles is n = V / Vm
• What is the value of Avogadro's number?

  6.022 x 10^23
• Avogadro's constant is the number of particles in 1 mole of any substance.


  True
• The value of Avogadro's constant is 6.022 x 10^23 particles/mol
• The molar mass of water (H2O) is 18 g/mol
• The molar mass is the mass of one mole of a substance, expressed in grams per mole
• Mass-mole conversions involve converting between the mass of a substance and the number of moles
• Match the term with its symbol and unit:

  Mass ↔️ m ||| g

  Molar Mass ↔️ Mr ||| g/mol

  Moles ↔️ n ||| mol
• Match the term with its symbol and unit:

  Moles ↔️ n ||| mol

  Volume ↔️ V ||| L

  Molar Volume ↔️ Vm ||| L/mol
• What is the value of Avogadro's constant?

  6.022 x 10^23
• What is the fundamental unit used to measure the amount of a substance in chemistry?

  Mole
• What is the formula to calculate the number of moles (n) of a substance using its mass (m) and molar mass (Mr)?

  n = m / Mr
• What does 'm' represent in the formula n = m / Mr?

  Mass in grams
• What is the formula to convert between the volume of a gas (V) and the number of moles (n)?

  n = V / Vm
• What is the molar volume of a gas at standard temperature and pressure?

  22.4 L/mol
• What does 'N' represent in the formula n = N / NA?

  Number of particles
• Avogadro's constant is the number of particles in 1 mole of a substance


  True
• Volume-mole conversions use the concept of molar volume
• Match the term with its symbol:

  Mole ↔️ n

  Mass ↔️ m

  Relative Atomic Mass ↔️ Ar

  Relative Molecular Mass ↔️ Mr
• Why is Avogadro's constant significant in chemistry?

  Relates moles to particles
• What is the molar mass of a substance?

  Mass of one mole
• To calculate the molar mass of water (H2O), you add the relative atomic masses of hydrogen and oxygen.
• If you have 24 grams of carbon and the relative atomic mass of carbon is 12 g/mol, how many moles do you have?

  2 mol
• Avogadro's constant relates the amount of substance in moles to the number of particles in that substance.


  True
• What is the molar mass expressed in?

  g/mol
• What is the molar mass of water (H2O), given Ar(H) = 1 g/mol and Ar(O) = 16 g/mol?

  18 g/mol
• The molar volume of a gas at STP is 22.4 L/mol.


  True
• Avogadro's number is defined as the number of atoms in exactly 12 grams of carbon-12
• Why is Avogadro's constant significant in chemistry?

  Relates moles to particles