Empirical formula from mass or mass % (Convert mass % to moles; divide by smallest mole amount to get atom ratio)

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Convert mass % to moles; divide by smallest mole amount to get atom ratio

What each symbol means

SymbolWhat it stands for
A_iAtomic mass
m_iMass of element i in sample
ratioDivide all n_i by min(n_i) to reach integers

When to use this

Pure compound; ratios are smallest whole numbers (within experimental error).