The molecular weight of Benzene [C₆H₆] is 78.1122.

Benzene [C₆H₆] is an organic compound of two elements: Carbon and Hydrogen. The molecular weight of Benzene is 78.1122 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of Carbon and Hydrogen.

CALCULATION PROCEDURE: Benzene [C₆H₆] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Benzene molecule.
From the chemical formula, you will know different atoms and their number in a Benzene molecule. The chemical formula of Benzene is C₆H₆. From the chemical formula, you can find that one molecule of Benzene has six Carbon (C) atoms and six Hydrogen (H) 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)

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

Number of Carbon atoms in Benzene: 6
Atomic weight of Carbon: 12.0107
Total weight of Carbon atoms in Benzene: 12.0107 x 6 = 72.0642

Number of Hydrogen atoms in Benzene: 6
Atomic weight of Hydrogen: 1.008
Total weight of Hydrogen atoms in Benzene: 1.008 x 6 = 6.048

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

Molecular weight of Benzene: 72.0642 (Carbon) + 6.048 (Hydrogen) = 78.1122

So the molecular weight of Benzene is 78.1122.

Benzene [C₆H₆] Molecular Weight Calculation

REFERENCES:

• Lanl-1: https://periodic.lanl.gov/1.shtml 
• Pubchem-Hydrogen : https://pubchem.ncbi.nlm.nih.gov/element/Hydrogen 
• Jlab-ele006; https://education.jlab.org/itselemental/ele006.html
• Pubchem-6: https://pubchem.ncbi.nlm.nih.gov/element/6

See also:

• Apiose (C5H10O5) Molecular Weight Calculation