Using R.I.C.E. Tables and stoichiometry with limiting reactants - PowerPoint PPT Presentation

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Using R.I.C.E. Tables and stoichiometry with limiting reactants

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  1. Using R.I.C.E. Tables and stoichiometry with limiting reactants

  2. RICE tables are a common tool of chemists (college professors use then a lot!) to organize the information for stoichiometry with a reaction and set up mathematical equations when necessary to solve for unknowns. R = reaction (balanced) I = initial conditions (before the reaction) C = change (remove reactants, form products) E = end conditions (after the reaction)

  3. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed?

  4. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? BEWARE: Moles goes into a RICE table and moles will come out. To find volume will require a final step.

  5. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R =

  6. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O

  7. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I =

  8. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I = 10. g

  9. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I = 10. g 0.625 mol ? 0 0

  10. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I = 10. g 0.625 mol ? 0 0 C =

  11. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I = 10. g 0.625 mol ? 0 0 C = -1x -3x +2x +2x

  12. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I = 10. g 0.625 mol ? 0 0 C = -1x -3x +2x +2x all the ethene will be burned, so x = 0.63 mol

  13. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I = 10. g 0.625 mol ? 0 0 C = -1x -3x +2x +2x -0.625 mol -1.875 mol +1.25 mol +1.25 mol

  14. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I = 10. g 0.625 mol ? 0 0 C = -1x -3x +2x +2x -0.625 mol -1.875 mol +1.25 mol +1.25 mol E =

  15. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I = 10. g 0.625 mol ? 0 0 C = -1x -3x +2x +2x -0.625 mol -1.875 mol +1.25 mol +1.25 mol E = 0 ?-1.875 mol 1.25 mol 1.25 mol

  16. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? How many moles of CO2 was formed?

  17. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? How many moles of CO2 was formed? 1.3 mol

  18. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? How many moles of CO2 was formed? 1.3 mol What volume of CO2 was formed?

  19. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? How many moles of CO2 was formed? 1.3 mol What volume of CO2 was formed? 1.25 mol x 22.4 L/mol = 28 L

  20. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? How many moles of CO2 was formed? 1.3 mol What volume of CO2 was formed? 1.25 mol x 22.4 L/mol = 28 L What other information do we already know?

  21. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? • How many moles of CO2 was formed? 1.3 mol • What volume of CO2 was formed? • 1.25 mol x 22.4 L/mol = 28 L • What other information do we already know? • Moles of O2 consumed • Moles of H2O produced

  22. Example 2: 10. grams of ethene is combusted with 50. grams of O2. What volume of carbon dioxide can be formed?

  23. Example 2: 10. grams of ethene is combusted with 50. grams of O2. What volume of carbon dioxide can be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O

  24. Example 2: 10. grams of ethene is combusted with 50. grams of O2. What volume of carbon dioxide can be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I = 10. g 50. g 0.625 mol 1.56 mol

  25. Example 2: 10. grams of ethene is combusted with 50. grams of O2. What volume of carbon dioxide can be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I = 10. g 50. g 0.625 mol 1.56 mol C = -1x -3x +2x +2x WHICH X TO USE? SMALLEST X!

  26. Example 2: 10. grams of ethene is combusted with 50. grams of O2. What volume of carbon dioxide can be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I = 10. g 50. g 0.625 mol 1.56 mol C = -1x -3x +2x +2x WHICH X TO USE? SMALLEST X! If 0.625 = 1 x, then x = 0.625 If 1.56 = 3 x, then x = 0.521 ← SMALLEST

  27. Example 2: 10. grams of ethene is combusted with 50. grams of O2. What volume of carbon dioxide can be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I = 10. g 50. g 0.625 mol 1.56 mol C = -1x -3x +2x +2x -0.521 mol -1.56 mol +1.04 mol 1.04 mol

  28. Example 2: 10. grams of ethene is combusted with 50. grams of O2. What volume of carbon dioxide can be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I = 10. g 50. g 0.625 mol 1.56 mol C = -1x -3x +2x +2x -0.521 mol -1.56 mol +1.04 mol 1.04 mol E = 0.625 mol – 0.521 mol 1.56 mol – 1.56 mol 1.04 mol 1.04 mol 0.104 mol 0 1.04 mol 1.04 mol

  29. Example 2: 10. grams of ethene is combusted with 50. grams of O2. What volume of carbon dioxide can be formed? What volume of CO2 is actually produced? 1.04 mols x 22.4 L/mol = 23 L

  30. Example 2: 10. grams of ethene is combusted with 50. grams of O2. What volume of carbon dioxide can be formed? • What volume of CO2 is actually produced? • 1.04 mols x 22.4 L/mol = 23 L • What else do we know? • Moles of ethene left over • Moles of water actually produced

  31. Why use a RICE table for limiting reactant problems? How many RR tracks would it have taken?

  32. Why use a RICE table for limiting reactant problems? How many RR tracks would it have taken? 2 to figure out which one is limiting

  33. Why use a RICE table for limiting reactant problems? How many RR tracks would it have taken? 2 to figure out which one is limiting 1 more to find amount of excess

  34. Why use a RICE table for limiting reactant problems? How many RR tracks would it have taken? 2 to figure out which one is limiting 1 more to find amount of excess 1 more for each of the additional products

  35. Why use a RICE table for limiting reactant problems? How many RR tracks would it have taken? 2 to figure out which one is limiting 1 more to find amount of excess 1 more for each of the additional products It is your choice. We did 1 RICE table vs 4 RR Tracks. RICE tables will be necessary later. For now, it is optional.