Ch.10 - Molecular Shapes & Valence Bond TheoryWorksheetSee all chapters
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Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
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Ch.10 - Molecular Shapes & Valence Bond Theory
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Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Prontosil, also known as KL730, was the sulfa drug used in 1936 to treat Franklin Roosevelt Jr, the son of the then President of the United States. What is the ideal value for the bond angle labeled "b"?

A. 45°

B. 90°

C. 109.5°

D. 120°

E. 180°


We’re being asked to identify the bond angle in Prontosil. Since the Lewis structure for the compound is already given, we simply need to do the following steps:

Step 1: Determine the number of electron groups around the indicated atom.

Step 2: Determine the electron geometry and bond angle using this:

Electron Regions          Electronic Geometry          Bond Angles

2                                      linear                                    180˚

3                                      trigonal planar                      120˚

4                                      tetrahedral                            109.5˚

5                                      trigonal bipyramidal              90˚, 120˚, and 180˚

6                                      octahedral                            90˚ and 180˚

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