Stoichiometry

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Author:
Anonymous
ID:
138777
Filename:
Stoichiometry
Updated:
2012-02-29 20:47:16
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Stoichiometry
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Description:
Basic concepts of stoichiometry
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  1. What are the three steps to getting a molecular formula?
    • 1. Use empirical formula to calculate empirical formula mass from periodic table.
    • 2. Divide molar mass given in problem by the empirical formula mass.
    • 3. Multiply subscripts of the empirical formula by your answer from #2.
  2. What are the four steps for determining the empirical formula?
    • 1. Assume % is mass (grams)
    • 2. Convert grams to moles
    • 3. Divide by smaller number
    • 4. Multiply to get whole numbers
  3. Name the 7 diatomic molecules.
  4. hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, and iodine
  5. Why do we care about stoichiometry?
    • Companies use stoichiometry to reduce waste, keep costs down and create products that work.
    • We use ideas of stoichiometry in our everyday lives.
  6. How many steps are used to convert the following:
    1. grams to grams
    2. moles to grams
    3. moles to moles
    4. grams to moles
    • 1. 4
    • 2. 3
    • 3. 2
    • 4. 3
  7. How do you calculate the percent yield?
    First calculate the theoretical yield (the amount produced in a perfect reaction). This is a gram to gram (4 step problem).

    • % yield = (AY/TY) x 100

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