# Ammonium iodide [NH4I] Molecular Weight Calculation

The molecular weight of Ammonium iodide [NH4I] is 144.94321.

Ammonium iodide [NH4I] is an inorganic compound of three elements: Nitrogen, Hydrogen, and Iodine. The molecular weight of Ammonium iodide is 144.94321 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of Nitrogen, Hydrogen, and Iodine.

# CALCULATION PROCEDURE: Ammonium iodide [NH4I] Molecular Weight Calculation

Step 1: Find the chemical formula and determine constituent atoms and their number in an Ammonium iodide molecule.
You will know different atoms and their number in an Ammonium iodide molecule from the chemical formula. The chemical formula of Ammonium iodide is NH4I. From the chemical formula of Ammonium iodide, you can find that one molecule of Ammonium iodide has one Nitrogen (N) atom, four Hydrogen (H) atoms, and one Iodine (I) atom.

Step 2: Find out the atomic weights of each atom (from the periodic table).

Atomic weight of Nitrogen (N): 14.00674 (Ref: Jlab-ele007)
Atomic weight of
Hydrogen (H): 1.008 (Ref: Lanl-1)
Atomic weight of Iodine (I): 126.90447 (Ref: Jlab-ele053, Ciaaw-iodine, Nist-53)

Step 3: Calculate the total weight of each atom in an Ammonium iodide molecule by multiplying its atomic weight by its number.

Number of Nitrogen atoms in Ammonium iodide: 1
Atomic weight of Nitrogen (N): 14.00674
Total weight of Nitrogen atoms in Ammonium iodide: 14.00674 x 1 = 14.00674

Number of Hydrogen atoms in Ammonium iodide: 4
Atomic weight of Hydrogen (H): 1.008
Total weight of Hydrogen atoms in Ammonium iodide: 1.008 x 4 = 4.032

Number of Iodine atoms in Ammonium iodide: 1
Atomic weight of Iodine (I): 126.90447
Total weight of Iodine atoms in Ammonium iodide: 126.90447 x 1 = 126.90447

Step 4: Calculate the molecular weight of Ammonium iodide by adding up the total weight of all atoms.

Molecular weight of Ammonium iodide: 14.00674 (Nitrogen) + 4.032 (Hydrogen) + 126.90447 (Iodine) = 144.94321

So the molecular weight of Ammonium iodide is 144.94321.

Ammonium iodide [NH4I] Molecular Weight Calculation

## REFERENCES:

• Lanl-1: https://periodic.lanl.gov/1.shtml
• Jlab-ele007: https://education.jlab.org/itselemental/ele007.html
• Jlab-ele053: https://education.jlab.org/itselemental/ele053.html
• Ciaaw-iodine: https://www.ciaaw.org/iodine.htm
• Nist-53: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=53