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Finding Empirical Formulas

Finding Empirical Formulas. Chapter 10. Steps. Change mass % values to grams. Convert grams to moles (1 step) Find the lowest ratio of moles-by dividing all of the values in step 2 by the smallest of the values in step 2.

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Finding Empirical Formulas

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  1. Finding Empirical Formulas Chapter 10

  2. Steps • Change mass % values to grams. • Convert grams to moles (1 step) • Find the lowest ratio of moles-by dividing all of the values in step 2 by the smallest of the values in step 2. • If necessary, multiply all resulting values by the same constant to get a whole number. • Use the whole numbers to write the empirical formula.

  3. Example #1 36.1%Ca, 63.9%Cl • 36.1g Ca, 63.9g Cl

  4. Example #2 13.6% C, 86.4% F • 13.6 g C, 86.4 g F

  5. Example #3 88.9% C, 11.1% H 1. 88.9g C, 11.1g H

  6. Example #4 20.2% Mg, 26.7% S, 53.2% O • 20.2g Mg, 26.7g S, 53.2g O

  7. Example #5 34.6% C, 3.9% H, 61.5% O 1. 34.6g C, 3.9g H, 61.5g O

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