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Empirical Formulas

Empirical Formulas. Gives the lowest whole-number ratio of the elements in a compound. Example: Hydrogen Peroxide (H 2 O 2 ) Empirical Formula- HO. Steps. Determine the number of moles for each element. Divide all elements by the smallest number of moles.

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Empirical Formulas

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  1. Empirical Formulas

  2. Gives the lowest whole-number ratio of the elements in a compound. • Example: Hydrogen Peroxide (H2O2) • Empirical Formula- HO

  3. Steps • Determine the number of moles for each element. • Divide all elements by the smallest number of moles. • You may need to multiply in order to get all elements in whole numbers.

  4. Determining Empirical Formulas • A compound is analyzed and found to contain 25.9% nitrogen and 74.1% oxygen. What is the empirical formula?

  5. Calculate the empirical formulas: • 94.1% O, 5.9% H

  6. 67.6% Hg, 10.8% S, 21.6% O

  7. Molecular Formulas • Can be a multiple of the empirical formula. • Example: H2O2 can be divided by 2 to become HO.

  8. Finding Molecular Formula of a Compound • Calculate the molecular formula of a compound whose molar mass is 60.0 g/mole and the empirical formula is CH4N. • CH4N has a empirical formula mass of 30.0 g/mole. • So 60.0 g/ 30.0 g = 2 • Molecular formula = C2H8N2

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