1. Mole Relations in Chemical Equations
Students will learn how to predict the mass of products expected in a chemical reaction

2. Review: Finding the moles from the grams
7.0 grams Na2SO4 = __________ moles
30.0 grams KMnO4 = __________ moles
17.0 grams PCl3= __________ moles

3. Review: Finding the grams from the moles
1.5 mole NaCl = __________ grams
.0165 mole K2SO4 = _________ grams
1.25 mole Cu(NO3)2 = ________ grams

4. Hydrogen and Oxygen React. How much water will be produced?
The reaction between hydrogen and oxygen can be read a couple different ways.
2H2 + O2  2H2O
Two molecules of hydrogen react with one molecule of oxygen
Two moles of hydrogen react with one mole of oxygen

5. N2 + 3H2  2NH3

6. 2H2 + O2  2H2O
How many moles of oxygen do you need in the examples below?
12 mol of hydrogen ____________
25 mol of hydrogen ____________

7. Balance the equation (NH4)2Cr2O7  Cr2O3 + N2 + H2O
So this means that:
1.00 mole (NH4)2Cr2O7 produces ___ mole H2O
0.50 mole (NH4)2Cr2O7 produces ___ mole H2O

8. Video
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9. Calculations (NH4)2Cr2O7  Cr2O3 + N2 + 4H2O 25.2 g ↓ g g g
252 g/mol g/mol g/mol g/mol
(NH4)2Cr2O7  Cr2O N H2O
25.2 g ↓ g g g
mole mol mol mol

10. H2O2  H2O + O2 34 g/mol 18 g/mol 32 g/mol H2O2  H2O + O2 68 grams
mol mol mol

11. Fe + Cl2  FeCl3 55.8g/mol 71.0 g/mol 162.3 g/mol Fe + Cl2  FeCl3
3.0 ____ _____
____ ____ _____