Unfortunately, there is no chemical substance with the formula H2O5. A chemical formula indicates the number of atoms of each element in a molecule. In this formula, we see there are 2 hydrogen atoms and 5 oxygen atoms, but there is no substance with such a structure.
Perhaps you’ve confused H2O (water) and H2O2 (hydrogen peroxide). H2O is a colorless, odorless, tasteless liquid at room temperature and the most important substance in our lives. H2O2 is a colorless liquid, highly flammable, and easily decomposes into water and oxygen.
However, if you are looking for information about a specific chemical substance, we advise you to re-identify the chemical formula. Chemistry knowledge is an important part of science education, and understanding specific substances can help you better grasp how the world operates.