This is why i'm dumb please help!

When svante arrhenius first proposed his acid-base theory, he was a doctoral candidate. his professors thought his ideas were unfounded. within a decade, the arrhenius theory of acid-base was widely accepted and praised within the scientific world. arrhenius defined acids as compounds having ionizable hydrogen and bases as compounds with ionizable a) barium. b) hydronium. c) hydroxide. d) oxygen.

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

What is the molar mass of a gas that has density of 2.054 g/l