What is the chemical name for the compound represented by N2O5?

The compound N2O5 is named dinitrogen pentoxide, and this name comes from the systematic way we identify the number of atoms of each element present in the molecule. The prefix "di-" indicates that there are two nitrogen (N) atoms, and the prefix "penta-" indicates that there are five oxygen (O) atoms. Therefore, the correct name reflects both the number of nitrogen atoms and the number of oxygen atoms in the compound.

In contrast, other names listed do not accurately reflect the composition of N2O5. For instance, dinitrogen trioxide would imply two nitrogen atoms and three oxygen atoms, which does not match the formula. Dinitrogen monocoxide incorrectly suggests only one oxygen atom is present, and nitrogen tetroxide indicates a compound with one nitrogen atom and four oxygen atoms, which also does not correspond to N2O5. Thus, the name dinitrogen pentoxide is the only correct representation of the given molecular formula.