Chemistry Practice Problems Bond Angles Practice Problems Solution: What is the value of the bond angles in BCl 3?

Solution: What is the value of the bond angles in BCl 3?

Problem

What is the value of the bond angles in BCl 3?

Solution

We’re being asked to identify the bond angle in BCl3. Since we don’t know the Lewis structure for BCl3, 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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