Stoichiometry

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.
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
Name the 7 diatomic molecules.
hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, and iodine
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.
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
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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Card Set

Stoichiometry

Description

Basic concepts of stoichiometry

Updated

3/1/2012, 1:47:16 AM

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