Empirical and Molecular Formulas

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Empirical and Molecular Formulas

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Presentation transcript:

Empirical and Molecular Formulas Courtesy www.lab-initio.com

Formulas Empirical formula: the lowest whole number ratio of atoms in a compound. Molecular formula: the true number of atoms of each element in the formula of a compound. molecular formula = (empirical formula)n molecular formula = C6H6 = (CH)6 empirical formula = CH

Formulas (continued) Examples: Formulas for ionic compounds are ALWAYS empirical (lowest whole number ratio). Examples: NaCl Al2(SO4)3 MgCl2 K2CO3

Formulas (continued) Formulas for molecular compounds MIGHT be empirical (lowest whole number ratio). Molecular: H2O C6H12O6 C12H22O11 Empirical: H2O CH2O C12H22O11