empiricalformula

empiricalformula - Empirical Formula Empirical Formula- is...

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Empirical Formula Empirical Formula- is a chemical formula that gives the simplest whole number ratio of atoms present in the formula unit of a compound. Empirical Formula Molecular Formula _______________________________________________________________________ _ CH C 6 H 6 HO H 2 O 2 BNH 2 B 3 N 3 H 6 H 2 O H 2 O The molecular formula is the true formula for the compound while the empirical formula is the molecular formula reduced to the lowest whole number ratio. To work an empirical formula problem, the problem must give you either the grams of each element in the compound or the percentage of each element in the compound. If percentages are given, assume 100g for the sample size and the percentages become grams. Example Problem: A compound is found to contain 53% Al and 47% O. What is the empirical formula for the compound? Step 1 - Calculate the number of moles of each element. (53g Al/1)(1 mole /27g) = 1.96 (be sure to leave the moles in three significant figures) (47g O/1)(1 mole/16g) = 2.94
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This note was uploaded on 10/13/2009 for the course CHEM 1441 taught by Professor Tanizaki during the Spring '08 term at UT Arlington.

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empiricalformula - Empirical Formula Empirical Formula- is...

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