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Empirical Formula

Empirical Formula - Empirical Formula From percentage to...

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Empirical Formula From percentage to formula
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The Empirical Formula The lowest whole number ratio of elements in a compound. The molecular formula the actual ratio of elements in a compound The two can be the same. CH 2 empirical formula C 2 H 4 molecular formula C 3 H 6 molecular formula • H O both
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Calculating Empirical Just find the lowest whole number ratio C 6 H 12 O 6 CH 4 N It is not just the ratio of atoms, it is also the ratio of moles of atoms In 1 mole of CO 2 there is 1 mole of carbon and 2 moles of oxygen In one molecule of CO 2 there is 1 atom of C and 2 atoms of O
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Calculating Empirical Pretend that you have a 100 gram sample of the compound. That is, change the % to grams. Convert the grams to mols for each element. Write the number of mols as a subscript in a chemical formula. Divide each number by the least number. Multiply the result to get rid of any fractions.
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Example Calculate the empirical formula of a compound composed of 38.67 % C, 16.22
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