I’m sorry, but Cr2O3Br2 is not a valid chemical formula. It seems there has been a confusion in identifying the chemical substance.
In chemistry, the symbol Cr2O3 represents Iron (III) oxide, a red-black or green solid often used in many industrial applications. It has a molecular weight of 151.99 and consists of two iron atoms and three oxygen atoms.
Br2 represents bromine, a quite common non-metal atom in nature, usually found in compound form rather than as individual atoms.
Cr2O3 and Br2 cannot combine to form a valid compound, because Iron (III) oxide is a solid that does not easily dissolve in water, and bromine is a brown-red liquid with a distinctive unpleasant smell.
Due to the molecular structure and properties of chemical substances, chemical reactions may occur between bromine and other compounds, but not with Iron (III) oxide.