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Terms Precision Accuracy Significant figures/digits Scientific notation Unit conversions

TermsAtomic massAvogadro’s numberMolar massMole Formulas

n= m M

n= N NA

m = N M NA

TermsAnhydrousEmpirical formulaHydrateLaw of definite proportionsMass percentMolecular formulaPercentage composition

Problem typesFind....- % composition from chemical formula- % composition from experimental data- EF from MF - EF from % composition- MF from EF and molar mass- % composition of hydrate - Carbon-hydrogen combustion analysis

Problem types

Find....-% composition from chemical formula-% composition from experimental data-EF from MF -EF from % composition-MF from EF and molar mass-% composition of hydrate

TermsActual YieldExcess reactantMole ratiosPercentage yieldStoichiometry – Mass-mass, mole-mole, mass-

mole, etc…Stoichiometric coefficientsThe Mole PathLimiting reactantTheoretical yield

Problem typesFind....- Coefficients of balanced chemical equation

for mole ratio- Amounts of reactants and products in a

reaction- The limiting reactant and excess reactant- Percentage yield of reaction

%yield= actual yield x 100 theoretical yield