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Empirical formula calculations: using moles

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I can determine the empirical formulae of simple compounds using reactant masses or percentage composition.

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Empirical formula is the simplest whole number ratio of atoms of each element in a compound. Using the masses of elements reacted together, or their percentage compositions, calculate the empirical formula. Knowing the relative formula mass of a substance, and its empirical formula, calculate the molecular formula. Know that we are using moles, and molar ratios to calculate formulae

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