Question

I am supposed to name this using IUPAC method for binary compounds (i think)
arsenic(111) sulfide
silicon tetraiodide
antimony (111)bromide
ammonia gas
lead(11)

and the things in the brackets are supposed to be the roman numerals

Answer 1

I don't get it. Aren't these the names? Perhaps you want the formula. By the way, the Stock system uses Roman numerals. You have used the number 1; you should use the capital i so it would look like this.
arsenic (III) sulfide.
etc.

Answer 2

As2S3 is #1 (known as arsenious sulfide in the old days.)
SiI4
SbBr3
NH3
Pb^2+