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Moles and molar mass

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Heidi Cooley
Heidi Cooley

A mole is the standard unit used to measure very large quantities of small particles like atoms and molecules. It represents 6.02 x 1023 particles, which is an immense number that is difficult to comprehend. The molar mass of an element or compound is the mass in grams of one mole of that substance. To find molar mass, one does an atom inventory of the substance and multiplies the number of each type of atom by its atomic mass on the periodic table, then sums the results.

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What the heck is a mole? Unit 6: Moles
What the heck is a mole? • A mole is the SI unit used to measure the amount of a substance • It is used to measure LARGE amounts of very small things – like atoms, molecules, formula units, etc. • Abbreviation = mol
How big is a mole? • 1 mole of hockey pucks would equal the mass of the moon… • 1 mole of basketballs would fill a bag the size of the earth… • 1 mole of pennies would cover the Earth ¼ of a mile deep…
A MOLE IS REALLY REALLY
What’s a mole? • Count the following… – 1 dozen donuts = 12 donuts – 1 pair of shoes = 2 shoes – 1 gross of pencils = 144 pencils • A mole is used to count in the same way that a dozen, pair, or gross is! • It always equals the same quantity!
How big is a mole? • Avogadro came up with the concept of a mole • 1 mole = Avogadro’s number • 1 mole = 6.02 x 1023 particles (atoms, molecules, formula units… anything!)
How big is a mole? • A mole is very, very BIG • A mole of apples = 6.02 x 1023 apples • That’s 602,000,000,000,000,000,000,000 apples!
How big is a mole? • How many marbles are in one mole of marbles? – 6.02 x 1023 – 1 mole = 6.02x1023 of anything • How many balloons are in one mole of balloons? – 6.02 x 1023 – 1 mole = 6.02x1023 of anything • How many molecules are in one mole of C12H22O11? – 6.02 x 1023 – 1 mole = 6.02x1023 of anything
How big is a mole? 1 mole = 6.02 x 1023 atoms, molecules, formula units
Moles and molar mass
What is molar mass? • The molar mass is the mass (in grams) of one mole of a substance • Molar mass of an element (in grams) = 1 mole • Molar mass of compound (in grams) = 1 mole
How do you find the molar mass of elements and compounds? • Do an atom inventory and multiply by the atomic mass on the periodic table and add all the masses atomic number atomic mass
Practice Problems • Find the molar mass for: • Carbon • Chemical Formula: Molar Mass: • Conversion Factor: =
Practice Problems • Find the molar mass for… • Lithium • Chemical Formula: Molar Mass: • Conversion Factor: =
Practice Problems • Find the molar mass for… • Oxygen • Chemical Formula: Molar Mass: • Conversion Factor: =
Practice Problems • Find the molar mass for… • Glucose • Chemical Formula: Molar Mass: • Conversion Factor: =
Practice Problems • Find the molar mass for… • Strontium phosphate • Chemical Formula: Molar Mass: • Conversion Factor: =
1 mole = molar mass
What’s the difference between atoms, molecules and formula units? • Atoms are used for single elements (like Mg) • Molecules are used for covalent compounds (like Cl2) • Formula units are used for ionic compounds (like MgCl2)

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Moles and molar mass

  • 1. What the heck is a mole? Unit 6: Moles
  • 2. What the heck is a mole? • A mole is the SI unit used to measure the amount of a substance • It is used to measure LARGE amounts of very small things – like atoms, molecules, formula units, etc. • Abbreviation = mol
  • 3. How big is a mole? • 1 mole of hockey pucks would equal the mass of the moon… • 1 mole of basketballs would fill a bag the size of the earth… • 1 mole of pennies would cover the Earth ¼ of a mile deep…
  • 5. What’s a mole? • Count the following… – 1 dozen donuts = 12 donuts – 1 pair of shoes = 2 shoes – 1 gross of pencils = 144 pencils • A mole is used to count in the same way that a dozen, pair, or gross is! • It always equals the same quantity!
  • 6. How big is a mole? • Avogadro came up with the concept of a mole • 1 mole = Avogadro’s number • 1 mole = 6.02 x 1023 particles (atoms, molecules, formula units… anything!)
  • 7. How big is a mole? • A mole is very, very BIG • A mole of apples = 6.02 x 1023 apples • That’s 602,000,000,000,000,000,000,000 apples!
  • 8. How big is a mole? • How many marbles are in one mole of marbles? – 6.02 x 1023 – 1 mole = 6.02x1023 of anything • How many balloons are in one mole of balloons? – 6.02 x 1023 – 1 mole = 6.02x1023 of anything • How many molecules are in one mole of C12H22O11? – 6.02 x 1023 – 1 mole = 6.02x1023 of anything
  • 9. How big is a mole? 1 mole = 6.02 x 1023 atoms, molecules, formula units
  • 11. What is molar mass? • The molar mass is the mass (in grams) of one mole of a substance • Molar mass of an element (in grams) = 1 mole • Molar mass of compound (in grams) = 1 mole
  • 12. How do you find the molar mass of elements and compounds? • Do an atom inventory and multiply by the atomic mass on the periodic table and add all the masses atomic number atomic mass
  • 13. Practice Problems • Find the molar mass for: • Carbon • Chemical Formula: Molar Mass: • Conversion Factor: =
  • 14. Practice Problems • Find the molar mass for… • Lithium • Chemical Formula: Molar Mass: • Conversion Factor: =
  • 15. Practice Problems • Find the molar mass for… • Oxygen • Chemical Formula: Molar Mass: • Conversion Factor: =
  • 16. Practice Problems • Find the molar mass for… • Glucose • Chemical Formula: Molar Mass: • Conversion Factor: =
  • 17. Practice Problems • Find the molar mass for… • Strontium phosphate • Chemical Formula: Molar Mass: • Conversion Factor: =
  • 18. 1 mole = molar mass
  • 19. What’s the difference between atoms, molecules and formula units? • Atoms are used for single elements (like Mg) • Molecules are used for covalent compounds (like Cl2) • Formula units are used for ionic compounds (like MgCl2)