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n=mMn = \frac{m}{M}n=Mm where nnn=moles, mmm=mass(g), MMM=molar mass
atomic massmolecular mass×100%\frac{\text{atomic mass}}{\text{molecular mass}} \times 100\%molecular massatomic mass×100%
Simplest whole number ratio of atoms in a compound
Actual number of atoms in a compound
Molecular formula is a whole number multiple of empirical formula
% by mass, formula from %, combustion analysis, waters of cryst.
Water molecules trapped within crystal structure of compounds
Convert percentages to masses (assume 100g sample)
Divide each by the smallest number of moles
Percentages should add up to 100%
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