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Warm-up

Warm-up. Convert the following to moles (start by drawing the mole hill): 50 grams of H 2 O 100 grams of CaCO 3 150 grams of NaOH. Stoichiometry : Mol-Mol Ratios. Unit Seven, Day One Kimrey 9 November 2012. What is stoichiometry?.

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Warm-up

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  1. Warm-up • Convert the following to moles (start by drawing the mole hill): • 50 grams of H2O • 100 grams of CaCO3 • 150 grams of NaOH

  2. Stoichiometry:Mol-Mol Ratios Unit Seven, Day One Kimrey 9 November 2012

  3. What is stoichiometry? • Stoichiometry is the study of the quantitative relationships in reactions. • Use mole ratios (the coefficients) to convert between one substance to another in a BALANCED equation.

  4. Using the mole ratio • N2 + H2  NH3 • Balance the equation!!! • 3 moles of H2 = ? moles of NH3

  5. Why do we need the mol-mol ratio? • We’re going to use the mol-mol ratio to convert between different substances in our formula • N2 + 3H2  2NH3

  6. Steps for stoichiometry • Balance the equation • Determine the mol-mol ratio • Convert to moles (if you don’t have moles) • Use, and only use, the mole ratio to convert between substances.

  7. How many moles?? N2 + 3H2  2NH3 15 moles of N2= x moles of NH3

  8. N2 + 3H2  2NH3 30 moles of H2 = x moles of NH3

  9. Example Mol-mol • Al + HCl AlCl3 + H2 • Using the above reaction. How many moles of aluminum do I need to produce 6.75 moles of Hydrogen?

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