Question

What is the name of `N_2O_5`?

Answer 1

Dinitrogen pentoxide

Explanation:

The name of a binary covalent compound such as this is found by simply putting Greek prefixes in front of each element, excluding "mono-" for the first element only, and listing it in order of how the elements appear in the compound.

"Di-" is the prefix for `2`, and "penta-" is the prefix for `5` (for oxygen, the final "a" is often excluded in the prefixes), thus, the name is dinitrogen pentoxide.