Question

what does "(s)" mean after a compound? For example FezO3(s).

Answer 1

this is not chemistry section.

the 's' means solid.

Answer 2

these are chemical reactions in which states of matter are denoted

(s) = solid
(l) = liquid
(g)= gas
ther are other things like uparrow mark = liberated
down arrow mark = precipitated
delta (a small triangle over the equal to sign) which shows heating
and some molecules have a " .Xh20" which shows water of hydration example (fe2O3.6H2O)

but yea post it in chem section :P