Unfortunately, it seems that there has been a mistake in the chemical formula you provided. H2Cr6O5 is not a recognized chemical compound. Compounds of Chromium and oxygen typically have formulas Cr2O3 (Chromium(III) oxide), CrO3 (Chromium(VI) oxide), or CrO2 (Chromium(IV) oxide).
For each chemical compound, information such as name, atomic mass, atomic weight, ion structure, physical and chemical properties, common chemical equations, and preparation methods, will all vary.
If you want to know about a specific chemical compound, please provide the exact formula so that we can provide the most detailed and accurate information.
Remember, chemistry is a vast and complex field, so understanding specific compounds requires a substantial amount of knowledge and broad understanding.