Mutagen enhanced longsword attack on Rat 3
1d20+2 + 4 for Mutagen
20, possible crit
14+2+4 to confirm
1d8+2+4 for Mutagen=8+2+4= 12 if not a crit, and that would be 20 if that confirms a crit.
This is my first ragechemist build so I think I've got all of this right but please correct my math if I have pooched it.