2.2.1 The mole concept

• What is a mole in chemistry?

  A unit of substance amount
• The molar mass of a substance is the mass of one mole in grams.


  True
• One mole contains 6.022 x 10²³ particles.
• Match the substance with its molar mass (g/mol):

  Water ↔️ 18.02

  Carbon Dioxide ↔️ 44.01

  Glucose ↔️ 180.18
• To convert between grams and moles, we use the concept of molar mass.
• What is the formula to convert mass in grams to moles?

  Moles = Mass / Molar Mass
• The molar mass of a substance is calculated from the atomic masses in its molecular formula
• What is the numerical value of Avogadro's constant?

  6.022 x 10²³
• Avogadro's number represents the number of particles in one mole.


  True
• What is the molar mass of water (H₂O)?

  18.02 g/mol
• To convert from grams to moles, you divide the mass by the molar mass.


  True
• Avogadro's number is represented by the symbol N_A
• How do you convert grams to moles?

  Divide by molar mass
• Avogadro's number is the number of particles in one mole.


  True
• What is the formula to convert moles to mass in grams?

  Mass = Moles x Molar Mass
• What is the term used for the mass in grams of one mole of a substance?

  Molar mass
• To convert from grams to moles, you divide the mass by the molar mass.

  True
• The mole is a unit of amount of substance.
• Steps to calculate the molar mass of a substance

  1️⃣ Identify the molecular formula

  2️⃣ Find the atomic mass of each element

  3️⃣ Multiply each atomic mass by its subscript

  4️⃣ Sum the products to obtain the molar mass
• To convert between grams and moles, the concept of molar mass is used.
• How many grams are in 3 moles of CO₂?

  132.03 grams