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

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

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**Using R.I.C.E. Tables and stoichiometry with limiting**reactants**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)**Example 1: 10. grams of ethene is combusted. What volume of**carbon dioxide will be formed?**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.**Example 1: 10. grams of ethene is combusted. What volume of**carbon dioxide will be formed? R =**Example 1: 10. grams of ethene is combusted. What volume of**carbon dioxide will be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O**Example 1: 10. grams of ethene is combusted. What volume of**carbon dioxide will be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I =**Example 1: 10. grams of ethene is combusted. What volume of**carbon dioxide will be formed? R = C2H4 + 3O2→ 2CO2 + 2H2O I = 10. g**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**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 =**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**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**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**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 =**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**Example 1: 10. grams of ethene is combusted. What volume of**carbon dioxide will be formed? How many moles of CO2 was formed?**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**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?**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**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?**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**Example 2: 10. grams of ethene is combusted with 50. grams**of O2. What volume of carbon dioxide can be formed?**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**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**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!**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**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**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**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**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**Why use a RICE table for limiting reactant problems?**How many RR tracks would it have taken?**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**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**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**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.