Ag(s) + H2 S(g) + O2(g) ⟶ Ag2 S(s) + H2 O(l)=
Go online to this link and see if it will help you:
http://www.webqc.org/balance.php?reaction=Ag(s)+%2B+H2S(g)+%2B+O2+%3D+Ag2S(s)(tarnish)+%2B+H2O(l)
