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Chemistry stoichiometry pancake stoichiometry

Chemistry stoichiometry pancake stoichiometry. Calculators required Periodic table required. The Key to Stoichiometry – The Mole Ratio. 2Al 2 O 3(l)  4Al (s) + 3O 2(g) Mole ratios allow us to “convert” between different reactants and products.

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Chemistry stoichiometry pancake stoichiometry

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  1. Chemistrystoichiometrypancake stoichiometry Calculators required Periodic table required

  2. The Key to Stoichiometry – The Mole Ratio • 2Al2O3(l) 4Al(s) + 3O2(g) • Mole ratios allow us to “convert” between different reactants and products. • What is the mole ratio between Al2O3 and Al? • 2 mol Al2O3 : 4 mol Al • We can write this as a conversion factor: • We can now “convert” between amounts of different compounds.

  3. One Conversion: mol  mol • CO2(g) + 2LiOH(s) Li2CO3(s) + H2O(l) • How many moles of lithium hydroxide are required to react with 20 mol CO2? • Molar ratio between CO2 and LiOH? • 1:2

  4. You try: mol  mol • How many moles of chlorine gas (Cl2) would react with 5 moles of sodium (Na) according to the following chemical equation? • 2 Na + Cl2  2 NaCl

  5. Mass-Mass Stoichiometry • We just converted between moles of one substance into moles of another substance using a chemical reaction. • In practice, it is more common to convert from grams of one substance to grams of another. • We have to use the mole as a bridge. • How do we convert between grams and moles?

  6. Stoichiometric Setup • A  2 B • In order to convert between grams of A and grams of B, you have to use molar masses and the molar ratio as conversion factors. • If you are not given a reaction, you must generate it yourself! • grams A  moles A  moles B  grams B (molar mass A) (molar ratio) (molar mass B) • It is very important to analyze the problem to figure out how many steps to use! • You can start and end at any point on this bridge!!

  7. Sample Problem 2 • What number of moles of O2 are needed to produce 14.2 grams of P4O10 from P? (molar mass of P4O10 = 284 g/mol) P + O2  P4O10 (unbalanced)

  8. Sample Problem 3 • 2NaCl  2Na + Cl2 • How many grams of chlorine gas are produced if 60 grams of sodium chloride are exposed to an electric current?

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