The molecular weight of Perchloric acid (HClO_{4}) is 100.4583.

Perchloric acid (HClO_{4}) 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 [HClO**_{4}] Molecular Weight Calculation

_{4}] 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 HClO

_{4}. 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 [HClO_{4}] Molecular Weight Calculation

Molecular weight of Perchloric acid [HClO_{4}] | |||

Constituent atoms | Number of each atom | Atomic weight | Total weight |

Hydrogen (H) | 1 | 1.008 | 1.008 |

Chlorine (Cl) | 1 | 35.4527 | 35.4527 |

Oxygen (O) | 4 | 15.9994 | 63.9976 |

Molecular weight of Perchloric acid [HClO_{4}]: | 100.4583 |

## 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