1. Friday March 6
Objective: Determine the ratio of water molecules to copper sulfate molecules in a blue chemical.
Checkpoint:
How many moles in 3.54 grams of CO2?
How many grams in moles of CO2?
How many molecules in grams of H2?
How much does 3.24 x 1024 molecules of O2 weigh (in grams)?
Homework:
Study for quiz on Monday

2. 1 mole CO2 = g
How many moles in 3.54 grams of CO2?
3.54 g 1
mol
0.080 mol x =
44.01 g

3. g 1 mole CO2 = 44.01 g 44.01 x = 1 mol 10.167 grams 10.2 grams
How many grams in moles of CO2?
0.231 mol
44.01 g
grams
10.2 grams x = 1
mol

4. Grams  Moles  Molecules
How many molecules in grams of H2?
0.123 g 1
mol
6.02 x 1023
molecules x x
2.02 g 1
mol
x 1022 molecules
3.67 x 1022 molecules

5. Grams  Moles  Molecules
How much does 3.24 x 1024 molecules of O2 weigh (in grams)?
3.24 x 1024 molec 1
mol
32.00 g x x
molec
6.02 x 1023 1
mol
grams
172 grams

6. Turn in Lab Report (with rubric)
now 5 days late

7. Finding Moles Mini-Lab (due Tuesday)

9. Mass of test tube + copper sulfate (before heating)
Mass of empty test tube
Mass of test tube + copper sulfate
(before heating)
Mass of test tube + copper sulfate (Trial 1)
Mass of test tube + copper sulfate (Trial 2)
Mass of test tube + copper sulfate (Trial 3)
10.00 grams
20.00 grams
18.00 grams
16.00 grams
15.00 grams

10. Take out mole worksheet to be stamped
Calculate the original mass of hydrated copper sulfate (CuSO4 bonded to water molecules), before heating.
Calculate the mass of total water loss in this experiment.
Calculate how many moles of water this represents.
Calculate the mass of anhydrated CuSO4 (CuSO4 with water burned off), used in this experiment.
Calculate how many of moles of CuSO4 this represents.
What is the mole ratio of H2O to CuSO4? (moles H2O : moles CuSO4). Round to nearest whole number.
2 - 1
20.00 – = g CuSO4
2 - 5
20.00 – = 5.00 g H2O
5.00 g H2O  moles H2O
5 - 1
15.00 – = 5.00 g CuSO4
5.00 g CuSO4  moles CuSO4

11. 3 H2O : 1 CuSO4 26.27 moles of H2O 8.34 moles of CuSO4
What is the mole ratio of H2O to CuSO4? (moles H2O : moles CuSO4). Round to nearest whole number.
26.27 moles of H2O
8.34 moles of CuSO4
/ = 3.15
3 H2O : 1 CuSO4

13. Quiz on Monday Who cares? Why is this useful?
moles  grams and grams  moles
moles  molecules and molecules  moles
grams  moles  molecules
molecules  moles  grams
Who cares? Why is this useful?

14. Sugar + 5 Water + Baking Soda + 2 Corn Syrup + 2 Butter + 2 peanuts
Sugar + 5 Water + Baking Soda Corn Syrup Butter peanuts  Peanut Brittle
Wed / Thurs
Please bring $1 to help with materials

16. Sugar + 5 Water + Baking Soda + 2 Corn Syrup + 2 Butter + 2 peanuts  Peanut Brittle
.606 mol
get here
mol
3.12 mol
Start here