Write the balanced equation for the formation of sulfur trioxide, SO3, from the elements of sulfur, S, and oxygen, O2.

Question

Would it be:
2S(s)+3O2(g)->2SO3 ?

Answer 1

Yes, that is correct.

Answer 2

If your prof is a stickler, s/he may prefer that you write it as
S8 + O2 ==> SO3 and I will let you balance it.