The molecular weight of Perchloric acid (HClO₄) is 100.4583.

Perchloric acid (HClO₄) is an inorganic compound of three elements: Hydrogen, Chlorine, and Oxygen. The molecular weight of Perchloric acid is 100.4583 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: Perchloric acid  [HClO₄] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Perchloric acid molecule.
You will know different atoms and their number in a Perchloric acid molecule from the chemical formula. The chemical formula of Perchloric acid is HClO₄. The chemical formula shows that one molecule of Perchloric acid consists of one Hydrogen (H) atom, one Chlorine atom, and four Oxygen atoms.

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

Atomic weight of Hydrogen (H): 1.008 (Ref: Lanl-1)
Atomic weight of Chlorine (Cl): 35.4527 (Ref: jlab-ele017)
Atomic weight of Oxygen (O): 63.9976 (Ref: Jlab-ele008)

Step 3: Calculate the total weight of each atom in a Perchloric acid molecule by multiplying its atomic weight by its number.

Number of Hydrogen atoms in Perchloric acid: 1
Atomic weight of Hydrogen (H): 1.008
Total weight of Hydrogen atoms in Perchloric acid: 1.008 x 1 = 1.008

Number of Chlorine atoms in Perchloric acid: 1
Atomic weight of Chlorine (Cl): 35.4527
Total weight of Chlorine atoms in Perchloric acid: 35.4527 x 1 = 35.4527

Number of Oxygen atoms in Perchloric acid: 4
Atomic weight of Oxygen (O): 15.9994
Total weight of Oxygen atoms in Perchloric acid: 15.9994 x 4 = 63.9976

Step 4: Calculate the molecular weight of Perchloric acid by adding up the total weight of all atoms.

Molecular weight of Perchloric acid: 1.008 (Hydrogen) + 35.4527 (Chlorine) + 63.9976 (Oxygen) = 100.4583

So the molecular weight of Perchloric acid is 100.4583.

Perchloric acid [HClO₄] Molecular Weight Calculation

REFERENCES:

• Lanl-1: https://periodic.lanl.gov/1.shtml 
• Jlab-ele008: https://education.jlab.org/itselemental/ele008.html
• Pubchem-Chlorine: https://pubchem.ncbi.nlm.nih.gov/element/Chlorine

See also:

• Hydrogen chloride molecular weight calculation