1. Stoichiometry Chemistry Recipes

2. Stoichiometry Stoichiometry is the study of the relationship between the AMOUNTS of reactants and products in a chemical reaction Stoichiometry provides RECIPES for chemical reactions.

3. Key Concept of Unit The Coefficients of the balanced chemical equation represent the reacting ratios of particles (MOLES) of reactants and products.

4. Stoichiometry Problem Set HW 6-1 1) 2 Mg + O 2 → 2 MgO video linkvideo link

5. HW 6-1, Problem #2 2) 2 H 2 + O 2 → 2 H 2 O video link

6. HW 6-1, #3 N 2 + 3 H 2 → 2 NH 3

7. Stoichiometry Problem Set HW 6-1 4) 2 Mg + O 2 → 2 MgO atoms molecules formula units Formula Unit = (“simplest ratio of ionic lattice molecule”) A) 4 atoms + 2 molecules → B) 8 atoms + → 8 form. units C) + 10 molecules → 4 form. units 4 molecules 20 atoms 20 form. units

8. HW 6-1, #5 5. N 2 + 3 H 2 → 2 NH 3 molecules molecules molecules A) + 15 molecules → B) 6.022 x 10 23 + → molecules molecules molecules C) 1 mole + → 5 molecules 10 molecules 3 (6.022 x 10 23 ) 2 (6.022 x 10 23 ) 3 moles 2 moles

9. HW 6-1, Problem #6 2) 2 H 2 + O 2 → 2 H 2 O A) 2 moles + moles → moles B) moles + 4 moles → moles C) moles + moles → 10 moles 2 5 8 8 10 1

10. Quantities in a Balanced Chemical Equation

11. Use mole bridge for more complex ratios HW 6-1, #7A 4 NH 3 + 7 O 2 → 4 NO 2 + 6 H 2 O ? Moles 10.0 moles 10.0 moles O 2 ( 7 moles O 2 4 moles NH 3 ) Answer: 40/7 = 5.71 (3 SF, matches given)

12. Use mole bridge for more complex ratios HW 6-1, #7A 4 NH 3 + 7 O 2 → 4 NO 2 + 6 H 2 O 11.5 moles ? Moles 11.5 moles NO 2 ( 4 moles NO 2 6 moles H 2 O ) Answer: 17.25 = 17.3 (3 SF, matches given)

13. Use mole bridge for more complex ratios HW 6-1, #7A 4 NH 3 + 7 O 2 → 4 NO 2 + 6 H 2 O ? Moles 8.6 moles 8.6 moles NH 3 ( 6 moles H 2 O 4 moles NO 2 ) Answer: 5.733 = 5.7 (2 SF, matches given)

14. Use mole bridge for more complex ratios HW 6-1, #7A 4 NH 3 + 7 O 2 → 4 NO 2 + 6 H 2 O 9.2 moles ? Moles 9.2 moles O 2 ( 7 moles O 2 6 moles H 2 O ) Answer: 7.887 = 7.9 (2 SF, matches given)