The molecular weight of Heptachlor (C_{10}H_{5}Cl_{7}) is 373.3159.

Heptachlor (C_{10}H_{5}Cl_{7}) is an organic compound of three elements: Carbon, Hydrogen, and Chlorine. The molecular weight of Heptachlor is 373.3159 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

**CALCULATION PROCEDURE: Heptachlor [C**_{10}H_{5}Cl_{7}] Molecular Weight Calculation

_{10}H

_{5}Cl

_{7}] Molecular Weight Calculation

**Step 1: Find out the chemical formula and determine constituent atoms and their number in a Heptachlor molecule.**You will know different atoms and their number in a Heptachlor molecule from the chemical formula. The chemical formula of Heptachlor is C

_{10}H

_{5}Cl

_{7}. The chemical formula shows that one molecule of Heptachlor consists of ten Carbon (C) atoms, five Hydrogen (H) atoms, and seven Chlorine atoms.

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

Atomic weight of Carbon (C): 12.0107 (Ref: Jlab-ele006)

Atomic weight of Hydrogen (H): 1.008 (Ref: Lanl-1)

Atomic weight of Chlorine (Cl): 35.4527 (Ref: jlab-ele017)

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

Number of Carbon atoms in Heptachlor: 10

Atomic weight of Carbon (C): 12.0107

Total weight of Carbon atoms in Heptachlor: 12.0107 x 10 = 120.107

Number of Hydrogen atoms in Heptachlor: 5

Atomic weight of Hydrogen (H): 1.008

Total weight of Hydrogen atoms in Heptachlor: 1.008 x 5 = 5.04

Number of Chlorine atoms in Heptachlor: 7

Atomic weight of Chlorine (Cl): 35.4527

Total weight of Chlorine atoms in Heptachlor: 35.4527 x 7 = 248.1689

**Step 4: Calculate the molecular weight of Heptachlor by adding up the total weight of all atoms.**

Molecular weight of Heptachlor: 120.107 (Carbon) + 5.04 (Hydrogen) + 248.1689 (Chlorine) = 373.3159

So the molecular weight of Heptachlor is 373.3159.

Heptachlor [C_{10}H_{5}Cl_{7}] Molecular Weight Calculation

Molecular weight of Heptachlor [C_{10}H_{5}Cl_{7}] | |||

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

Carbon (C) | 10 | 12.0107 | 120.107 |

Hydrogen (H) | 5 | 1.008 | 5.04 |

Chlorine (Cl) | 7 | 35.4527 | 248.1689 |

Molecular weight of Heptachlor [C_{10}H_{5}Cl_{7}]: | 373.3159 |

## REFERENCES:

- Lanl-1: https://periodic.lanl.gov/1.shtml
- Jlab-ele006: https://education.jlab.org/itselemental/ele006.html
- Pubchem-Chlorine: https://pubchem.ncbi.nlm.nih.gov/element/Chlorine