Regrettably, Cr2O3NO5 is not a valid chemical compound in the system of inorganic chemistry. Inorganic chemistry mainly deals with compounds that do not contain carbon, except for some simple inorganic compounds containing carbon such as CO, CO2, and the groups of carbonates, bicarbonates, and cyanides.
Cr2O3NO5 does not follow the general rules for the combination of elements in inorganic chemistry. Specifically, Cr2O3 is an inorganic compound of chromium with oxygen, it is called chromium (III) oxide. Meanwhile, NO5 is not a valid radical in inorganic chemistry. Nitrate and nitrite ions (NO3- and NO2-) are common nitrogen radicals.
Therefore, it is impossible to specify the properties, chemical equations, and synthesis methods for Cr2O3NO5. This could be an error in chemical notation or a confusion with another compound.