Which of the following is the correct name for the molecular compound with the chemical formula NH_3?

Recall the naming conventions for molecular compounds: use prefixes to indicate the number of atoms (mono-, di-, tri-, etc.) and the element names, but some common compounds have special names.

Consider the options: 'Nitrogen hydride' and 'Hydrogen nitride' are generic names, 'Nitrogen trihydride' follows the prefix rule but is not commonly used, and 'Ammonia' is the well-known common name for NH_3.