1.1 Moles and Molar Mass

• One mole of a substance contains 6.022 × 10²³ particles
• The mole is defined as the amount of a substance that contains 6.022 × 10²³ particles
• The molar mass of a substance is expressed in grams per mole
• Steps to calculate molar mass using the periodic table

  1️⃣ Identify the elements

  2️⃣ Find atomic masses

  3️⃣ Add atomic masses
• What is the value of Avogadro's number?

  6.022 × 10²³
• What is the unit of molar mass?

  grams per mole
• What is the molar mass of a substance if 2 moles weigh 88.02 grams?

  44.01 g/mol
• What is the atomic mass of carbon?

  12.01 g/mol
• What is the formula to convert grams to moles?

  Moles = Grams / Molar Mass
• Convert 50 grams of CO₂ to moles.

  1.136 moles
• What does the mole measure?

  Amount of substance
• Avogadro's number is 6.022 × 10²³.

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• Avogadro's number is a fundamental constant in chemistry.

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• The mole is defined as the amount of substance containing 6.022 × 10²³ particles
• Carbon has an atomic mass of 12.01 g/mol.


  True
• Avogadro's number connects moles to the number of particles in a substance.


  True
• One mole of a substance contains 6.022 × 10²³ particles
• Molar mass is essential for stoichiometric conversions between mass and moles.


  True
• Molar mass is used in stoichiometry to convert between mass and moles.


  True
• The molar mass of CO₂ is calculated as (1 × 12.01) + (2 × 16.00) = 44.01 g/mol
• What is the formula to convert moles to grams?

  Grams = Moles × Molar Mass
• How many grams are in 3 moles of H₂O (molar mass = 18.015 g/mol)?

  54.045 grams
• What constant connects moles to the number of particles?

  Avogadro's number
• What is the formula to convert grams to moles?

  Moles = Grams / Molar Mass
• What is the significance of Avogadro's number?

  Connects moles to particles
• What is the formula for molar mass?

  Molar Mass = Mass / Moles
• The formula for molar mass is Mass/Moles
• Oxygen has an atomic mass of 16.00 g/mol
• Molar mass is expressed in units of grams per mole
• What is the value of Avogadro's number?

  6.022 × 10²³
• Match the unit with its definition:

  Gram ↔️ Weight of a substance

  Mole ↔️ 6.022 × 10²³ particles

  Molar Mass ↔️ Mass of one mole

  Avogadro's Number ↔️ Number of particles
• Steps to calculate molar mass using the periodic table:

  1️⃣ Identify the elements

  2️⃣ Find atomic masses

  3️⃣ Add atomic masses
• Adding the atomic masses of all atoms in a compound gives its molar mass.

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• How many moles are in 50 grams of CO₂ (molar mass = 44.01 g/mol)?

  1.136 moles
• The formula to convert grams to moles is Moles = Grams / Molar Mass
• Understanding molar mass conversions is vital for solving stoichiometry problems.


  True