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Chemistry · L3 · Empirical Formula from Percent Composition

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The four-step method: assume 100 g, convert each element's mass to moles, divide by the smallest mole value, then clear any fractions to reach the empirical formula.

by @openstemUpdated Chemistry
Percent compositionof each elementAssume a100 g sampleConvert each massto moles: n = m/MDivide every mole valueby the smallest oneAll ratios closeto whole numbers?Round to whole numbersMultiply every ratio by thesmallest integer that clears itEmpirical formulayesno, a fraction like x.5 or x.33 remains

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