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mole
measures amount of substance
molar mass
The mass of one mole of a substance, typically expressed in grams per mole (g/mol).
percent composition
mass of element in 1 mol compound
molar mass of whole compound
multiply by 100
empirical formula
starting percent given (changes to g)
mass of element from table.
divide all by the lowest number to get amnt of elements in the formula
molecular formula
find the molar mass of the empirical formula,
mass given in problem
mass of the empirical formula
multiply everything by the nearest whole number—> 5(CH) —> C5H5
