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Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
Lecture 12.2b- Gram-Gram Stoich
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Lecture 12.2b- Gram-Gram Stoich

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Section 12.2 Lecture (part B) for Honors & Prep Chemistry

Section 12.2 Lecture (part B) for Honors & Prep Chemistry

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  • In this Hubble Space Telescope image, clouds of condensed ammonia are visible covering the surface of Saturn.
  • In this Hubble Space Telescope image, clouds of condensed ammonia are visible covering the surface of Saturn.
  • With your knowledge of conversion factors and this problem-solving approach, you can solve a variety of stoichiometric problems. Identifying What conversion factor is used to convert moles to representative particles?
  • Transcript

    • 1.
      • A sample of NaCl has a mass of 150g. How many moles does the sample contain?
      • What is the mass of 5.3 moles of water?
      Bellwork- mole  gram conversions mol 18 1 g g mol 1 58.44 = 2.57 moles NaCl = 95.4 grams 5.3 mol x 150g NaCl x
    • 2.
      • STOICHIOMETRY
      • You must be able to
      • Balance equations
      • Convert between moles and grams
    • 3.
          • For Stoichiometry–
          • You ALWAYS use moles!!
              • If you are not given moles you must convert to moles.
    • 4.
          • 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.
    • 5.
      • Most stoichiometry problems involve masses.
    • 6.
      • Most stoichiometry problems involve masses.
      • Convert grams to moles using the molar mass of the given compound.
    • 7.
      • Most stoichiometry problems involve masses.
      • Convert grams to moles using the molar mass of the given compound.
      • Convert moles of the given compound to moles of the wanted compound using a mole ratio.
    • 8.
      • Most stoichiometry problems involve masses.
      • Convert grams to moles using the molar mass of the given compound.
      • Convert moles of the given compound to moles of the wanted compound using a mole ratio.
      • Convert moles to grams using the molar mass of the new compound.
    • 9. 12.3 Step 2- Use a mole ratio to convert to moles of another compound. 2.7mol H 2 mol H 2 mol NH 3 3 2 = 1.8 mol NH 3 Step 1- CONVERT TO MOLES!! 5.4g H 2 x ______ = 2.7mol H 2 1 mole 2.0g x
    • 10. Step 3- Convert moles to grams 1.8 mol NH 3 1 mole NH 3 17g = 31g NH 3 Step 1- CONVERT TO MOLES!! 5.4g H 2 x ______ = 2.7mol H 2 1 mole 2.0g Step 2- Use a mole ratio to convert to moles of another compound. 2.7mol H 2 x mol H 2 mol NH 3 3 2 = 1.8 mol NH 3 x
    • 11. `
    • 12.
      • Problem-Solving Approach
      Given(G)  Wanted(W) Divide to get moles Use mole ratio multiply to get g or L
    • 13.  
    • 14.  
    • 15.  
    • 16.  
    • 17.
        • N 2 ( g ) + 3H 2 ( g )  2NH 3 ( g )
        • 2. What volume of H 2 is required to react with 3.0 L of N 2 , and what volume of NH 3 is produced at STP?
          • volume of H 2 = 9.0 L, volume of NH 3 = 6.0 L
          • volume of H 2 = 3.0 L, volume of NH 3 = 3.0 L
          • volume of H 2 = 3.0 L, volume of NH 3 = 6.0 L
          • volume of H 2 = 1.0 L, volume of NH 3 = 1.5 L
    • 18.
        • 3. Automotive airbags inflate when sodium azide, NaN 3 , rapidly decomposes to its component elements via this reaction:
        • 2NaN 3  2Na + 3N 2 .
        • How many grams of sodium azide are required to form 5.00 g of nitrogen gas?
          • 11.61 g
          • 17.41 g
          • 7.74 g
          • 1.36 g

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