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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.

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Presentation on theme: "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."— Presentation transcript:

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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 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 = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O

7 Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O I =

8 Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O I = 10. g

9 Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O I = 10. g mol?00

10 Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O I = 10. g mol?00 C =

11 Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O I = 10. g mol?00 C = -1x-3x+2x+2x

12 Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? R = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O I = 10. g mol?00 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 = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O I = 10. g mol?00 C = -1x-3x+2x+2x mol 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 = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O I = 10. g mol?00 C = -1x-3x+2x+2x mol 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 = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O I = 10. g mol?00 C = -1x-3x+2x+2x mol mol+1.25 mol+1.25 mol E = 0? mol1.25 mol1.25 mol

16 Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? How many moles of CO 2 was formed?

17 Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? How many moles of CO 2 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 CO 2 was formed? 1.3 mol What volume of CO 2 was formed?

19 Example 1: 10. grams of ethene is combusted. What volume of carbon dioxide will be formed? How many moles of CO 2 was formed? 1.3 mol What volume of CO 2 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 CO 2 was formed? 1.3 mol What volume of CO 2 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 CO 2 was formed? 1.3 mol What volume of CO 2 was formed? 1.25 mol x 22.4 L/mol = 28 L What other information do we already know? Moles of O 2 consumed Moles of H 2 O produced

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

23 R = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O

24 Example 2: 10. grams of ethene is combusted with 50. grams of O 2. What volume of carbon dioxide can be formed? R = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O I = 10. g50. g mol1.56 mol

25 Example 2: 10. grams of ethene is combusted with 50. grams of O 2. What volume of carbon dioxide can be formed? R = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O I = 10. g50. g mol1.56 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 O 2. What volume of carbon dioxide can be formed? R = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O I = 10. g50. g mol1.56 mol C =-1x-3x+2x+2x WHICH X TO USE? SMALLEST X! If = 1 x, then x = If 1.56 = 3 x, then x = ← SMALLEST

27 Example 2: 10. grams of ethene is combusted with 50. grams of O 2. What volume of carbon dioxide can be formed? R = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O I = 10. g50. g mol1.56 mol C =-1x-3x+2x+2x mol-1.56 mol+1.04 mol1.04 mol

28 Example 2: 10. grams of ethene is combusted with 50. grams of O 2. What volume of carbon dioxide can be formed? R = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O I = 10. g50. g mol1.56 mol C =-1x-3x+2x+2x mol-1.56 mol+1.04 mol1.04 mol E = mol – mol1.56 mol – 1.56 mol 1.04 mol1.04 mol mol01.04 mol1.04 mol

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


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