The molecular weight of Pentane (C₅H₁₂) is 72.1495.

Pentane (C₅H₁₂) is an organic compound of two elements: Carbon, and Hydrogen. The molecular weight of Pentane is 72.1495 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: Pentane  [C₅H₁₂] Molecular Weight Calculation

Step 1: Find the chemical formula and determine constituent atoms and their number in a Pentane molecule.
You will know different atoms and their number in a Pentane molecule from the chemical formula. The chemical formula of Pentane is C₅H₁₂. The chemical formula shows that one Pentane molecule consists of five Carbon (C) atoms and twelve 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 Pentane molecule by multiplying its atomic weight by its number.

Number of Carbon atoms in Pentane: 5
Atomic weight of Carbon (C): 12.0107
Total weight of Carbon atoms in Pentane: 12.0107 x 5 = 60.0535

Number of Hydrogen atoms in Pentane: 12
Atomic weight of Hydrogen (H): 1.008
Total weight of Hydrogen atoms in Pentane: 1.008 x 12 = 12.096

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

Molecular weight of Pentane: 60.0535 (Carbon) + 12.096 (Hydrogen) = 72.1495

So the molecular weight of Pentane is 72.1495.

Pentane [C₅H₁₂] 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