16s - Molecular Formulas There is a fast way to look at a...

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Molecular Formulas There is a fast way to look at a molecular formula and get some structural information. This same method allows you to look at a structure and rapidly calculate its molecular formula. It’s all about hydrogen atoms. Rings and multiple bonds have fewer Hs than alkanes. C 3 H 8 C 3 H 6 C 3 H 4 C 3 H 6
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IHD = number of multiple bonds and/or rings in a molecule. Each triple bond has an IHD = 2. Each double bond has an IHD = 1. Each ring has an IHD = 1. IHD doesn’t tell you how many individual double bonds, triple bonds and rings a compound has, just the total amount . Index of Hydrogen Deficiency (IHD)
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Molecular Formulas All of these compounds have the formula C 4 H 6 :
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Halogens, like hydrogen, only form one bond. To calculate IHD they can be considered hydrogens. Index of Hydrogen Deficiency (IHD) CH 4 CH 3 Cl
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The presence of oxygen and sulfur do not affect the number of hydrogens. Index of Hydrogen Deficiency (IHD)
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This note was uploaded on 08/06/2011 for the course CHEM 221x taught by Professor Broyer during the Summer '11 term at USC.

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16s - Molecular Formulas There is a fast way to look at a...

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