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Unit 5: Stoichiometry

Unit 5: Stoichiometry. Section 2: Mole:Gram and Gram:Mole. Mole-to-Gram Formula. Use the coefficient from the balanced equation. Use the coefficient from the balanced equation. Mole-to-Gram Problems.

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Unit 5: Stoichiometry

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  1. Unit 5: Stoichiometry Section 2: Mole:Gram and Gram:Mole

  2. Mole-to-Gram Formula Use the coefficient from the balanced equation Use the coefficient from the balanced equation

  3. Mole-to-Gram Problems Ex-1: How many grams of water are produced at the same time that 100 moles of CO2 are made? C3H8 + O2 CO2 + H2O Step 1: Balance the equation C3H8 + 5O2 3CO2 + 4H2O

  4. Mole-to-Gram Problems Ex-1: How many grams of water are produced at the same time that 100 moles of CO2 are made? C3H8 + 5O2 3CO2 + 4H2O Step 2: Identify the “given” and “unknown” provided in the problem, including the units G: 100 mol CO2 U: # g H2O

  5. Mole-to-Gram Problems Ex-1: How many grams of water are produced at the same time that 100 moles of CO2 are made? C3H8 + 5O2 3CO2 + 4H2O G: 100 mol CO2 U: # g H2O Step 3: Begin with the “given” # then choose a conversion factor that has in its denominator the same units as those in the “given” 100 mol CO2 x _______ mol CO2

  6. Mole-to-Gram Problems Ex-1: How many grams of water are produced at the same time that 100 moles of CO2 are made? C3H8 + 5O2 3CO2 + 4H2O G: 100 mol CO2 U: # g H2O Step 4: The numerator needs to have the same unit as your “unknown.” Use the coefficients in the balanced equation that pertain to its unit to solve. 100 mol CO2 x 4 mol H2O 3 mol CO2

  7. Mole-to-Gram Problems Ex-1: How many grams of water are produced at the same time that 100 moles of CO2 are made? C3H8 + 5O2 3CO2 + 4H2O G: 100 mol CO2 U: # g H2O Step 5: The 3rd conversion factor allows for the transition from moles H2O to grams H2O through molar mass 100 mol CO2 x 4 mol H2O x 18.02 g H2O = 2402.67 3 mol CO21 mol H2O Make sure your final answer is in the same # of sig figs that your “given” is in with the correct unit!!! 2000 g H2O or 2x103 g H2O

  8. Mole-to-Gram Practice Ex-2: How many grams of oxygen are produced at the same time that 0.10 moles of CO2 are made? C3H8 + 5O2 3CO2 + 4H2O 5.3 g O2

  9. Mole-to-Gram Practice Ex-3: How many grams of C3H8 are produced at the same time that 35.0 moles of O2 are made? C3H8 + O2 CO2 + H2O C3H8 + 5O2 3CO2 + 4H2O G: 35.0 mol O2 U: # g C3H8 35.0 mol O2 x 1 mol C3H8 x 44.11 g C3H8 = 308.77 5 mol O21 mol C3H8 309 g C3H8

  10. Gram-to-Mole Formula Use the coefficient from the balanced equation Use the coefficient from the balanced equation

  11. Gram-to-Mole Problems Ex-1: How many moles of NO are produced at the same time as 100 grams of H2? NH3 + O2 NO + H2 Step 1: Balance the equation 2NH3 + O2 2NO + 3H2

  12. Gram-to-Mole Problems Ex-1: How many moles of NO are produced at the same time as 100 grams of H2? 2NH3 + O2 2NO + 3H2 Step 2: Identify the “given” and “unknown” provided in the problem, including the units G: 100 g H2 U: # mol NO

  13. Gram-to-Mole Problems Ex-1: How many moles of NO are produced at the same time as 100 grams of H2? 2NH3 + O2 2NO + 3H2 G: 100 g H2 U: # mol NO Step 3: Begin with the “given” # then choose a conversion factor that has in its denominator the same units as those in the “given”… this is its molar mass. The numerator will always be 1 mole of the “given” units 100 g H2 x 1 mol H2 2.02 g H2

  14. Gram-to-Mole Problems Ex-1: How many moles of NO are produced at the same time as 100 grams of H2? 2NH3 + O2 2NO + 3H2 G: 100 g H2 U: # mol NO Step 4: The 3rd conversion factor has moles of the “given” in its denominator and the moles of the “unknown” in its numerator. Take the numbers from the coefficients from the balanced equation. 100 g H2 x 1 mol H2 x 2 mol NO = 33.003 2.02 g H2 3 mol H2 Make sure your final answer is in the same # of sig figs that your “given” is in with the correct unit!!! 30 mol NO

  15. Gram-to-Mole Practice Ex-2: How many moles of NH3 are produced at the same time as 25 grams of O2? NH3 + O2 NO + H2 2NH3 + O2 2NO + 3H2 G: 25 g O2 U: # mol NH3 25 g O2 x 1 mol O2 x 2 mol NO = 1.5625 32.00g O2 1 mol O2 1.6 mol NH3

  16. Gram-to-Mole Practice Ex-3: How many moles of NO are produced at the same time as 670 grams of NH3? NH3 + O2 NO + H2 2NH3 + O2 2NO + 3H2 G: 670 g NH3 U: # mol NO 670 g NH3 x 1 mol NH3 x 2 mol NO = 39.319 17.04g NH3 2 mol NH3 39 mol NO

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