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Ch.9 - Chemical Bonding I: The Lewis Model
All textbooksTro 4th EditionCh.9 - Chemical Bonding I: The Lewis ModelProblem 98a,d
Chapter 9, Problem 98a,d

Draw the Lewis structure for each organic compound from its condensed structural formula. a. C3H8 d. CH3COOH

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1
Identify the number of valence electrons for each atom in the compound. Carbon has 4, hydrogen has 1, and oxygen has 6 valence electrons.
For C_3H_8 (propane), arrange the three carbon atoms in a chain. Each carbon atom forms four bonds. Connect the carbon atoms with single bonds and attach hydrogen atoms to satisfy the valence of each carbon.
For CH_3COOH (acetic acid), start by identifying the functional groups. The CH_3 group is a methyl group, and COOH is a carboxylic acid group.
In CH_3COOH, connect the CH_3 group to the carbon of the COOH group. The carbon in the COOH group is double-bonded to one oxygen and single-bonded to the OH group.
Ensure that all atoms have a complete octet (except hydrogen, which should have 2 electrons) and adjust any lone pairs on oxygen atoms as needed.

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Related Practice
Open Question
Draw the Lewis structure for nitric acid, ensuring the hydrogen atom is attached to one of the oxygen atoms. Include all three resonance structures by alternating the double bond among the three oxygen atoms. Use formal charge to determine which of the resonance structures is most important to the structure of nitric acid.
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Textbook Question

The cyanate ion (OCN-) and the fulminate ion (CNO-) share the same three atoms but have vastly different properties. The cyanate ion is stable, while the fulminate ion is unstable and forms explosive compounds. The resonance structures of the cyanate ion are explored in Example 9.8. Draw Lewis structures for the fulminate ion—including possible resonance forms— and use formal charge to explain why the fulminate ion is less stable (and therefore more reactive) than the cyanate ion.

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Textbook Question

Draw the Lewis structure for each organic compound from its condensed structural formula. b. CH3OCH3

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Textbook Question

Draw the Lewis structure for each organic compound from its condensed structural formula. c. CH3COCH3

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Textbook Question

Draw the Lewis structure for each organic compound from its condensed structural formula. e. CH3CHO

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