Understanding R.I.C.E. Tables and Stoichiometry for Limiting Reactants

R.I.C.E. tables play a crucial role in chemistry, particularly in stoichiometry when dealing with reactions and limiting reactants. This method involves organizing information and setting up equations to find unknowns. An example is provided with the combustion of ethene to determine the volume of carbon dioxide formed, demonstrating the step-by-step process using R.I.C.E. tables.

• Chemistry
• Stoichiometry
• R.I.C.E. Tables
• 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 all the ethene will be burned, so x = 0.63 mol -3x +2x +2x

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 -0.625 mol -1.875 mol +1.25 mol +1.25 mol -3x +2x +2x

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 -0.625 mol -1.875 mol +1.25 mol +1.25 mol -3x +2x +2x 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 -0.625 mol -1.875 mol +1.25 mol +1.25 mol -3x +2x +2x 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? What volume of CO2 was formed? 1.3 mol

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

20. Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? How many moles of CO2 was formed? What volume of CO2 was formed? 1.25 mol x 22.4 L/mol = 28 L 1.3 mol 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? What volume of CO2 was formed? 1.25 mol x 22.4 L/mol = 28 L 1.3 mol 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 0.625 mol 1.56 mol 50. g

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 0.625 mol 1.56 mol 50. g C = -1x WHICH X TO USE? SMALLEST X! -3x +2x +2x

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 0.625 mol 1.56 mol 50. g C = -1x WHICH X TO USE? SMALLEST X! -3x +2x +2x 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 0.625 mol 1.56 mol 50. g C = -1x -0.521 mol -1.56 mol +1.04 mol 1.04 mol -3x +2x +2x

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 0.625 mol 1.56 mol 50. g C = -1x -0.521 mol -1.56 mol +1.04 mol 1.04 mol -3x +2x +2x E = 0.625 mol 0.521 mol 0.104 mol 0 1.56 mol 1.56 mol 1.04 mol 1.04 mol 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.