Br2 is an oxidizing agent, Sb2O3 is a reducing agent.
Reactants:
Sb2O3 – Antimony(III) oxide
Other names: Antimony sesquioxide, Antimonous oxide, Flowers of AntimonyAntimony trioxide, Antimony white, Flowers of antimony, CI 77052, C.I. Pigment White 11
Appearance: White solid ; White crystalline odourless powder
Br2
Names: Bromine, Molecular bromine
Appearance: Fuming red-to-brown liquid with pungent odour ; Dark reddish-brown, fuming liquid with suffocating, irritating fumes.
Appearance: White solid, deliquescent ; White hygroscopic solid in various forms ; Odorless, white or slightly yellow lumps, rods, flakes, sticks, or pellets. [Note: May be used as an aqueous solution.]
Products:
K3SbO4
KBr
Names: Potassium bromide, KBr, Kaliumbromid
Appearance: White solid
H2O – Water, oxidane
Other names: Water (H2O), Hydrogen hydroxide (HH or HOH), Hydrogen oxideDihydrogen monoxide (DHMO) (systematic name), Hydrogen monoxide, Dihydrogen oxide, Hydric acid, Hydrohydroxic acid, Hydroxic acid, Hydrol, Μ-oxido dihydrogen, Κ1-hydroxyl hydrogen(0)
Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas