The molecular weight of Octane (C₈H₁₈) is 114.2296.

Octane (C₈H₁₈) is an organic compound of two elements: Carbon, and Hydrogen. The molecular weight of Octane is 114.2296 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: Octane  [C₈H₁₈] Molecular Weight Calculation

Step 1: Find the chemical formula and determine constituent atoms and their number in an Octane molecule.
You will know different atoms and their number in an Octane molecule from the chemical formula. The chemical formula of Octane is C₈H₁₈. The chemical formula shows that one Octane molecule consists of eight Carbon (C) atoms and eighteen 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 an Octane molecule by multiplying its atomic weight by its number.

Number of Carbon atoms in Octane: 8
Atomic weight of Carbon (C): 12.0107
Total weight of Carbon atoms in Octane: 12.0107 x 8 = 96.0856

Number of Hydrogen atoms in Octane: 18
Atomic weight of Hydrogen (H): 1.008
Total weight of Hydrogen atoms in Octane: 1.008 x 18 = 18.144

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

Molecular weight of Octane: 96.0856 (Carbon) + 18.144 (Hydrogen) = 114.2296

So the molecular weight of Octane is 114.2296.

Octane [C₈H₁₈] Molecular Weight Calculation

REFERENCES:

• Lanl-1: https://periodic.lanl.gov/1.shtml 
• Jlab-ele006: https://education.jlab.org/itselemental/ele006.html 

See also:

• Hydrogen chloride molecular weight calculation