1. Stoichiometry

2. Warm-Up

5. Example of stoich problem Magnesium metal burns in the air Mg (s) + O 2(g) MgO (s) 2 Mg (s) + O 2(g) 2 MgO (s) 3g? g

6. Example of stoich problem 2 Mg (s) + O 2(g) 2 MgO (s) 3 g? g 3 g 1 mol 24.3 g 24.3 g/mol 40.3 g/mol 0.123 mol 1 mol 40.3 g

7. Example of stoich problem 2 Mg (s) + O 2(g) 2 MgO (s) 3 g 4.96 g 3 g 1 mol 24.3 g 24.3 g/mol 40.3 g/mol 0.123 mol 1 mol 40.3 g

8. Percent Yield 2 Mg (s) + O 2(g) 2 MgO (s) 3 g 4.96 g (theoretical) 24.3 g/mol 40.3 g/mol 0.123 mol 3.72 g (actual) 3.72/4.96 x 100% = 75%

9. Questions that can be asked 2 Mg (s) + O 2(g) 2 MgO (s) 3 g? g 24.3 g/mol 40.3 g/mol 0.123 mol

10. Questions that can be asked 2 Mg (s) + O 2(g) 2 MgO (s) 3 g? g 24.3 g/mol 32.0 g/mol 0.123 mol How much oxygen is used in this reaction?

11. Questions that can be asked 2 Mg (s) + O 2(g) 2 MgO (s) 3 g? g 24.3 g/mol 32.0 g/mol 0.123 mol 3 g Mg 1 mol Mg 24.3 g Mg 2 mol Mg 1 mol O 2 = 1.97 g O 2 1 mol O 2 32.0 g O 2 mole ratio