The molecular weight of Ammonium persulfate [(NH₄)₂S₂O₈] is 228.20468.

Ammonium persulfate [(NH₄)₂S₂O₈] is an inorganic compound of four elements: Nitrogen, Sulfur, Hydrogen, and Oxygen. The molecular weight of Ammonium persulfate is 228.20468 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of Nitrogen, Sulfur, Hydrogen,  and Oxygen.

CALCULATION PROCEDURE: Ammonium persulfate [(NH₄)₂S₂O₈] Molecular Weight Calculation

Step 1: Find the chemical formula and determine constituent atoms and their number in an Ammonium persulfate molecule.
You will know different atoms and their number in an Ammonium persulfate molecule from the chemical formula. The chemical formula of Ammonium persulfate is N₂H₈S₂O₈. From the chemical formula of Ammonium persulfate, you can find that one molecule of Ammonium persulfate has two Nitrogen (N) atoms, eight Hydrogen (H) atoms, two Sulfur (S) atoms, and eight Oxygen (O) atoms.

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 Oxygen (O): 15.9994 (Ref: Jlab-ele008)
Atomic weight of Sulfur (S): 32.066 (Ref: Jlab-ele016)

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

Number of Nitrogen atoms in Ammonium persulfate: 2
Atomic weight of Nitrogen (N): 14.00674
Total weight of Nitrogen atoms in Ammonium persulfate: 14.00674 x 2 = 28.01348

Number of Hydrogen atoms in Ammonium persulfate: 8
Atomic weight of Hydrogen (H): 1.008
Total weight of Hydrogen atoms in Ammonium persulfate: 1.008 x 8 = 8.064

Number of Sulfur atoms in Ammonium persulfate: 2
Atomic weight of Sulfur (S): 32.066
Total weight of Sulfur atoms in Ammonium persulfate: 32.066 x 2 = 64.132

Number of Oxygen atoms in Ammonium persulfate: 8
Atomic weight of Oxygen (O): 15.9994
Total weight of Oxygen atoms in Ammonium persulfate: 15.9994 x 8 = 127.9952

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

Molecular weight of Ammonium persulfate:  28.01348 (Nitrogen) + 8.064 (Hydrogen) + 64.132 (Sulfur) + 127.9952 (Oxygen) +  = 228.20468

So the molecular weight of Ammonium persulfate is 228.20468.

Ammonium persulfate [(NH₄)₂S₂O₈] Molecular Weight Calculation

REFERENCES:

• Lanl-1: https://periodic.lanl.gov/1.shtml 
• Jlab-ele016: https://education.jlab.org/itselemental/ele016.html
  
• Jlab-ele008: https://education.jlab.org/itselemental/ele008.html
• Jlab-ele007: https://education.jlab.org/itselemental/ele007.html

See also:

• Apiose (C5H10O5) Molecular Weight Calculation