Chemistry Practice Problems Bond Angles Practice Problems Solution: According to VSEPR theory, the H-N-H bond in NH3 i...

Solution: According to VSEPR theory, the H-N-H bond in NH3 is approximately what angle?A) 90°B) 120°C) 107°D) 112°E) 180°

Problem

According to VSEPR theory, the H-N-H bond in NH3 is approximately what angle?

A) 90°

B) 120°

C) 107°

D) 112°

E) 180°

Solution

We’re being asked to identify the angle of H-N-H bond in NH3


Since we don’t know the Lewis structure for  NH3, we need to do the following steps:


Step 1: Determine the central atom in this molecule.

Step 2: Calculate the total number of valence electrons present.

Step 3: Draw the Lewis structure for the molecule.

Step 4: Determine the number of electron groups around the indicated atom.

Step 5: 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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