Question

why sulfur trioxide, SO3 has a bond angle of about 120 degrees

Answer 1

Explanation:

Moreover, as there are three oxygen, it will be X3. That means we have AX3 for the SO3 molecule. (By the way, that is the reason why SO3 is having the shape of Trigonal Planar.) The bond angle of SO3 is 120 degrees.

Answer 2

Explanation:

120° angle

Molecular structure and bonding

The Lewis structure consists of an S=O. double bond and two S–O dative bonds without utilizing d-orbitals. The electrical dipole moment of gaseous sulfur trioxide is zero. This is a consequence of the 120° angle between the S-O bonds.