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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 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)

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

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BEWARE: Moles goes into a RICE table and moles will come out. To find volume will require a final step.

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

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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

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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 =

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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

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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 0.625 mol?00

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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 0.625 mol?00 C =

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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 0.625 mol?00 C = -1x-3x+2x+2x

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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 0.625 mol?00 C = -1x-3x+2x+2x all the ethene will be burned, so x = 0.63 mol

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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 0.625 mol?00 C = -1x-3x+2x+2x -0.625 mol -1.875 mol+1.25 mol+1.25 mol

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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 0.625 mol?00 C = -1x-3x+2x+2x -0.625 mol -1.875 mol+1.25 mol+1.25 mol E =

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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 0.625 mol?00 C = -1x-3x+2x+2x -0.625 mol -1.875 mol+1.25 mol+1.25 mol E = 0?-1.875 mol1.25 mol1.25 mol

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

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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

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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?

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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

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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?

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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

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

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R = C 2 H 4 + 3O 2 →2CO 2 +2H 2 O

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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 0.625 mol1.56 mol

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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 0.625 mol1.56 mol C =-1x-3x+2x+2x WHICH X TO USE? SMALLEST X!

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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 0.625 mol1.56 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

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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 0.625 mol1.56 mol C =-1x-3x+2x+2x -0.521 mol-1.56 mol+1.04 mol1.04 mol

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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 0.625 mol1.56 mol C =-1x-3x+2x+2x -0.521 mol-1.56 mol+1.04 mol1.04 mol E = 0.625 mol – 0.521 mol1.56 mol – 1.56 mol 1.04 mol1.04 mol 0.104 mol01.04 mol1.04 mol

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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

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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

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

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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

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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

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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

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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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Stoichiometry “In solving a problem of this sort, the grand thing is to be able to reason backward. This is a very useful accomplishment, and a very easy.

Stoichiometry “In solving a problem of this sort, the grand thing is to be able to reason backward. This is a very useful accomplishment, and a very easy.

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