The molecular weight of Triethylene glycol [HOCH₂CH₂OCH₂CH₂OCH₂CH₂OH] is 150.1738.

To calculate molecular weight of any compound, the first step is to know the constituent atoms and their number in that particular compound. Then calculate the total weight of each atom by multiplying its atomic weight by its number. The sum of total weight of all constituent atoms will be the molecular weight of the compound. Note that the value of atomic weight may differ slightly from different sources.

CALCULATION PROCEDURE: Triethylene glycol [HOCH₂CH₂OCH₂CH₂OCH₂CH₂OH] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Triethylene glycol molecule.
From the chemical formula, you will know different atoms and their number in a Triethylene glycol molecule. Chemical formula of Triethylene glycol is C₆H₁₄O₄. From the chemical formula of Triethylene glycol, you can find that one molecule of Triethylene glycol has six Carbon (C) atoms, fourteen Hydrogen (H) atoms and two Oxygen (O) atoms.

Step 2: Find out atomic weights of each atom (from 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 Oxygen (O) : 15.9994 (Ref: Jlab-ele008)

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

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

Number of Hydrogen atoms in Triethylene glycol: 14
Atomic weight of Hydrogen: 1.008
Total weight of Hydrogen atoms in Triethylene glycol: 1.008 x 14 = 14.112

Number of Oxygen atoms in Triethylene glycol: 4
Atomic weight of Oxygen: 15.9994
Total weight of Oxygen atoms in Triethylene glycol: 15.9994 x 4 = 63.9976

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

Molecular weight of Triethylene glycol: 72.0642 (Carbon) + 14.112 (Hydrogen) + 63.9976 (Oxygen) = 150.1738

So the molecular weight of Triethylene glycol is 150.1738.

Triethylene glycol [HOCH₂CH₂OCH₂CH₂OCH₂CH₂OH] 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
• Jlab-ele008: https://education.jlab.org/itselemental/ele008.html
• Pubchem-8: https://pubchem.ncbi.nlm.nih.gov/element/8

See also:

• DeoxyTriethylene glycol (C5H10O4) Molecular Weight Calculation