2. Section 3.1 in class 1 mol = 6.022 x 1023 things
Two new conversions: Conversion Factors
atoms
molecules
Avogadro’s Number
6.022 x 1023 particles = 1 mol
moles
Molar mass
molar mass g = 1 mol
grams
moles

3. Chemical Formula is a conversion factor
molecules
atoms
moles of molecules
moles of
atoms

4. How big is Avogadro’s number. We cover the Earth with 1 mol of dice
How big is Avogadro’s number? We cover the Earth with 1 mol of dice. How deep is it? Surface area = 5.1 x 108 km2 1 km2 = 1 x 1010 cm2 1 die = 1 cm3 Height = volume/area

5. How many atoms in 3.46 mol Fe?

6. How many atoms in 3.46 mol Na?

7. How many moles is 80.0 g of Al?

8. How many atoms in 80.0 g of Al?

9. Molar Mass is a conversion factor
Determining Molar Mass (official)
Determining Molar Mass (practical)

10. Molar Mass is a conversion factor
Determining Molar Mass (official)
Determining Molar Mass (practical)

11. Molar Mass is a conversion factor
Determining Molar Mass (official)
Determining Molar Mass (practical)

12. What is the mass of 2.60 mol CH4?

14. How many moles and atoms of each element in 1.50 mol CH3OH?

15. A sample contains 5.80 x 1024 Ca atoms. What is the mass of Ca?

16. How many MOLECULES of boron trichloride, BCl3, are present in 1
How many MOLECULES of boron trichloride, BCl3, are present in 1.32 grams of this compound? How many Cl atoms are in the sample?

17. Which has more oxygen atoms: 12.0 g CH3OH or 40.0 g CBr2O

18. What is the mass of oxygen in 200 g of CBr2O?