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Quantities in Chemistry
Stoichiometry by any other name!
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The Mole How do you measure something? Mass: kilograms, grams
Volume: liters, mLs, cm3, Count: particles, moles Remember the mole: 6.022x1023 This is Avogadro’s Number
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Stoich…measuring So what do we need to be able to handle?
Can you calculate molar mass of a compound? Can you take a mass into convert it into moles? Can you take a volume of a gas and convert it into moles? Can you balance a chemical equation? IF the answer to these is yes, you can handle most stoichiometry problems you are likely to see
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Grams to moles You will need to be able to calculate the molar mass of the material under discussion Set up simple equation: (x grams AB)(1mole AB/molar mass grams AB) Multiplying this has grams cancel out, leaving moles AB.
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Moles to Moles If our reaction is AB A + B
Then you would set up this equation: (molesAB)[(coefficient A)/(coefficient AB)] which would cancel out and yield Moles A produced (Yes, it could be B instead, same type pathway)
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Moles back out to grams Following from the last step:
(Moles A)[(molar mass A)/(1 mole A)] yields mass of A produced by the decomposition reaction
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UNITS!! Make sure you label all numbers with their correct units
They will need to cancel out! If you get something like (moles)2 / grams, you know something is wrong (in this case, inverted)
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