SO3 Is a nonpolar molecule!
Let me break things down a little for you -
For starters let me explain what both polar and nonpolar even are to begin with.
Nonpolar is a type of chemical bond where two atoms share a pair of electrons with one another
While Polar takes a different approach and is basically chemical bonds where a pair of electrons is unequally shared between two atoms.
I hope all is well, and you pass! Good luck, rockstar! (:
