To calculate the formal charge of nitrogen in ammonia NH3 , we can use the following formula:Formal charge = Valence electrons of the atom - Non-bonding electrons - 0.5 * Bonding electrons In the case of nitrogen N , it has 5 valence electrons. In ammonia, nitrogen forms 3 single covalent bonds with 3 hydrogen atoms, which means it has 6 bonding electrons 2 electrons per bond . Nitrogen has no non-bonding electrons lone pairs in ammonia.Now, we can plug these values into the formula:Formal charge of N = 5 - 0 - 0.5 * 6 Formal charge of N = 5 - 0 - 3Formal charge of N = 2Therefore, the formal charge of nitrogen in ammonia NH3 is 0.