Understanding the Lewis Structure of SO3

The video tutorial explains how to draw the Lewis structure of sulfur trioxide (SO3). It begins by calculating the total valence electrons and discusses the concept of expanded octets, particularly for sulfur. The tutorial emphasizes minimizing formal charges to achieve the most stable Lewis structure. It also covers sulfur's bonding behavior with more electronegative elements like oxygen, leading to the formation of six bonds. The video concludes with a discussion on the molecular geometry of SO3, which is trigonal planar, and the hybridization of the central sulfur atom, which is sp2.

How many valence electrons are present in the SO3 molecule?

• 24

• 32

• 18

• 12

What is the significance of sulfur's ability to have an expanded octet?

• It limits sulfur to only two bonds.

• It allows sulfur to form more than four bonds.

• It restricts sulfur to exactly eight electrons.

• It prevents sulfur from bonding with oxygen.

What is the formal charge on sulfur in the most stable Lewis structure of SO3?

• +2

• -1

• +1

• 0

Why is the formal charge important in determining the best Lewis structure?

• It determines the color of the molecule.

• It helps in identifying the number of lone pairs.

• It ensures the molecule has the correct number of atoms.

• It minimizes the energy of the molecule.

What are resonance structures?

• Different molecules with the same formula.

• Molecules with different molecular weights.

• Structures with different numbers of atoms.

• Different arrangements of electrons in the same molecule.

Which of the following is true about the resonance structures of SO3?

• They all have different molecular weights.

• They are all equally stable.

• They have the same arrangement of atoms but different electron distributions.

• They have different numbers of sulfur atoms.

What is the molecular geometry of the SO3 molecule?

• Trigonal planar

• Linear

• Tetrahedral

• Bent

What is the typical bond angle in a trigonal planar molecule like SO3?

• 90 degrees

• 109.5 degrees

• 120 degrees

• 180 degrees

What type of hybridization occurs at the central sulfur atom in SO3?

• sp

• sp2

• sp3

• dsp3

Which orbitals are involved in the sp2 hybridization of sulfur in SO3?

• Two s and two p orbitals

• Two s and one p orbital

• One s and two p orbitals

• One s and one p orbital