Lacey_Che131_S2012_Lect-6s

Lacey_Che131_S2012_Lect-6s - Empirical & Molecular...

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Lec-6: Empirical & Molecular Formulas Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 1 Empirical & Molecular Formula A technique of analytical chemistry used to determine the relative amounts of each element in a chemical compound. ` Empirical Formula: Simplest whole-number molar ratio of elements in a compound. p ` Molecular Formula: Actual molar ratio of elements in a compound. Equal to some multiple of empirical formula: » Iron(III) oxide: (Fe 1 O 1.5 ) × 2 = Fe 2 O 3 Need empirical formula and molecular mass. Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 2 Empirical & Molecular Formula ` Empirical Formula: Simplest whole-number molar ratio of elements in a p compound. Substance Molecular rmula Empirical rmula formula formula Water H 2 OH 2 O Methane CH 4 CH 4 Benzene C 6 H 6 CH Sulfur S 8 S Glucose C 6 H 12 O 6 CH 2 O Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 3 Empirical & Molecular Formula ` Many compounds have the same empirical formula, but different molecular formulas: Glycoaldehyde » Molecular = C 2 H 4 O 2 Glucose » Molecular = C 6 H 12 O 6 Both compounds are carbo hydrates. » Empirical formula : C H 2 O Recall The molecular formula is a multiple of the empirical formula: Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 4
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Empirical Formula n empirical rmula can be obtained om e percent
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This note was uploaded on 03/29/2012 for the course CHE 131 taught by Professor Kerber during the Spring '08 term at SUNY Stony Brook.

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Lacey_Che131_S2012_Lect-6s - Empirical & Molecular...

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