Lecture 12.2a- Mol-Mol Stoich
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Lecture 12.2a- Mol-Mol Stoich

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Section 12.2a lecture for Honors & Prep Chemistry

Section 12.2a lecture for Honors & Prep Chemistry

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  • Manufacturing plants produce ammonia by combining nitrogen with hydrogen. Ammonia is used in cleaning products, fertilizers, and in the manufacture of other chemicals.

Lecture 12.2a- Mol-Mol Stoich Presentation Transcript

  • 1. Bellwork- Simple Stoich
    • H 2 O 2 (aq)  H 2 O (l) + O 2 (g)
    • 1. Balance the equation
    • 2. How many moles of H 2 O 2 must decompose in order to get 2 moles of O 2 (g)?
    • 3. How many liters of O 2 (g) are formed from the decomposition of 2 moles of H 2 O 2 at STP?
    • 4. Which are conserved in this reaction- Atoms, molecules, volume, moles, mass?
  • 2.
      • If given a quantity for one compound in a balanced equation you can calculate quantities for all of the others using stoichiometry .
      • Example- 2 moles of N 2 requires ____moles of H 2 and will produce ____moles of NH 3.
      • N 2 ( g ) + 3H 2 ( g )  2NH 3 ( g ) Reactant #1 Reactant #2 Product
    6 4
  • 3.
        • A mole ratio is a conversion factor made with the coefficients of a balanced chemical equation.
      • N 2 ( g ) + 3H 2 ( g )  2NH 3 ( g )
  • 4.
        • A mole ratio is a conversion factor made with the coefficients of a balanced chemical equation.
      • N 2 ( g ) + 3H 2 ( g )  2NH 3 ( g )
      • Some mole ratios:
      • 1 mole N 2 3 moles H 2 1 mole N 2
      • 3 moles H 2 1 mole N 2 2 mol NH 3
  • 5.
      • N 2 ( g ) + 3H 2 ( g )  2NH 3 ( g )
    Use a mole ratio to convert between two different compounds in a balanced equation!
      • Some mole ratios:
      • 1 mole N 2 3 moles H 2 1 mole N 2
      • 3 moles H 2 1 mole N 2 2 mol NH 3
  • 6.
    • STOICHIOMETRY
    • You need a balanced equation.
    • Convert the given quantity to moles if needed.
    • Convert moles of given compound to moles of another compound by using the mole ratio from the balanced equation.
    • Convert moles to grams if needed
    N 2 + 3H 2  2NH 3 .6mol N 2 x ________ 1mol N 2 2mol NH 3 = 1.2mol NH 3 These numbers come from the balanced equation
  • 7. for Sample Problem 12.2
  • 8.
        • For Stoichiometry–
        • You ALWAYS use moles!!
            • If you are not given moles you must convert to moles.
        • Use the mole ratio to convert between compounds.
  • 9.
      • 1. How many moles of water are produced when 2.5 mol of O 2 react according to the following equation?
          • C 3 H 8 + 5O 2  3CO 2 + 4H 2 O
        • 2.0
        • 2.5
        • 3.0
        • 4.0