Question

Match the formula for the following compound:
dinitrogen pentoxide

NO
N5O2
N2O5
N3O2

Answer 1

Dinitrogen = 2 Nitrogens, which is represented as N2
Pentoxide = 5 Oxygen atoms, which is O5

Slap em together and you get N2O5.

Answer 2

Answer : The correct formula of the compound is, $N_2O_5$

Explanation :

Dinitrogen pentoxide  is a covalent compound in which both the elements nitrogen and oxygen are non-metals.

The formula of covalent compound is given by:

• The less electronegative element is written first with prefix number like 'mono' for 1 atom, 'di' for 2 atoms, 'tri' for 3 atoms and so on.... in the subscript.
• The more electronegative element is written then with their prefix number in the subscript.

So, the formula of given compound is, $N_2O_5$