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molar mass
atomic mass on periodic table
memorize convertions
particles (atoms/formula units) —> moles —> grams
percent composition
(molar mass of element / total molar mass of compound) * 100
empirical formula
given grams/molar mass = number
number / lowest number = whole number
(round if needed)
molecular formula
molecular mass (given) / empirical mass (molar mass of all elements in compound) = whole number
multiply that whole number to the subscripts of the compound