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HONORS CHEMISTRYUnit D: Stoichiometry
CHAPTER NINE: STOICHIOMETRY
STOICHIOMETRYuSTOICHIOMETRY is the area of chemistry
that involves mass relationships between reactants and products
uBased on balanced chemical equations and the Law of Conservation of Mass
uThe MOLE CONCEPT is the backbone of STOICHIOMETRY
uYou have used the concept in COOKING!
STOICHIOMETRY PROBLEMSuStoichiometry problems can be
simple or a little challenginguRanging from a single step to
three or more stepsuProblem type can be identified
by the GIVEN information and the UNKNOWN or QUESTION ASKED
MOLE RATIOuMOLE RATIOS are derived from
Balanced EquationsuMOLE RATIOS are CONVERSION
FACTORSuMOLE RATIOS are the
backbone of stoichiometric calculations
uMOLE RATIOS covert from substance “A” to substance “B”
STOICH: LEVEL 1 (easy)uMole to Mole ProblemuSingle Step
CalculationuMole Ratio converts
“A” to “B”u“Given” a mole
amount and “Unknown” a mole amount
STOICH: LEVEL 2 (not bad)uMass to Mole Problem OR Mole to Mass ProblemuTwo Step CalculationuMole Ratio converts “A” to “B”uMolar Mass converts mass/moleu“Given” a mole amount and “Unknown” a mass
amount OR “Given” a mass amount and “Unknown” a mole amount
STOICH: LEVEL 3 (Nice!)uMass to Mass ProblemuThree Step CalculationuMole Ratio converts “A” to “B”uMolar Mass converts mass/mole… Two Times!u“Given” a mass amount and “Unknown” a mass
amount