Moles and molar mass

Overview of the concept of a mole 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…

4. A MOLE IS REALLY REALLY BIG!

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 10 23 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 10 23 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 10 23 1 mole = 6.02x10 23 of anything How many balloons are in one mole of balloons? 6.02 x 10 23 1 mole = 6.02x10 23 of anything How many molecules are in one mole of C 12 H 22 O 11 ? 6.02 x 10 23 1 mole = 6.02x10 23 of anything

9. How big is a mole? 1 mole = 6.02 x 10 23 atoms, molecules, formula units

10. 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

11. 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

12. Practice Problems Find the molar mass for: Carbon Chemical Formula: Molar Mass: Conversion Factor: =

13. Practice Problems Find the molar mass for… Lithium Chemical Formula: Molar Mass: Conversion Factor: =

14. Practice Problems Find the molar mass for… Oxygen Chemical Formula: Molar Mass: Conversion Factor: =

15. Practice Problems Find the molar mass for… Glucose Chemical Formula: Molar Mass: Conversion Factor: =

16. Practice Problems Find the molar mass for… Strontium phosphate Chemical Formula: Molar Mass: Conversion Factor: =

17. 1 mole = molar m ass

18. 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 Cl 2 ) Formula units are used for ionic compounds (like MgCl 2 )