The molecular weight of 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (C₁₈H₁₆BrN₅S), also called MTT, is 414.3243.

3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (C₁₈H₁₆BrN₅S) is an organic compound of five elements: Carbon, Hydrogen, Bromine, Nitrogen, and Sulfur. The molecular weight of 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide is 414.3243 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide  [C₁₈H₁₆BrN₅S] (MTT) Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide molecule.
You will know different atoms and their number in a 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide molecule from the chemical formula. The chemical formula of 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide is C₁₈H₁₆BrN₅S. From the chemical formula, you can find that one molecule of 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide consists of eighteen Carbon (C) atoms, sixteen Hydrogen (H) atoms, one Bromine (Br) atom, five Nitrogen (N) atoms, and one Sulfur atom.

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 Bromine (Br): 79.904 (Ref: Jlab-ele035)
Atomic weight of Nitrogen (N): 14.00674 (Ref: Jlab-ele007)
Atomic weight of Sulfur (S): 32.066 (Ref: Jlab-ele016)

Step 3: Calculate the total weight of each atom in a 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide molecule by multiplying its atomic weight by its number.

Number of Carbon atoms in 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide: 18
Atomic weight of Carbon (C): 12.0107
Total weight of Carbon atoms in 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide: 12.0107 x 18 = 216.1926

Number of Hydrogen atoms in 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide: 16
Atomic weight of Hydrogen (H): 1.008
Total weight of Hydrogen atoms in 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide: 1.008 x 16 = 16.128

Number of Bromine atoms in 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide: 1
Atomic weight of Bromine (Br): 70.9054
Total weight ofBromine atoms in 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide: 70.9054 x 1 = 70.9054

Number of Nitrogen atoms in 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide: 5
Atomic weight of Nitrogen (N): 14.00674
Total weight of Nitrogen atoms in 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide: 14.00674 x 5 = 70.0337

Number of Sulfur atoms in 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide: 1
Atomic weight of Sulfur (S): 32.066
Total weight of Sulfur atoms in 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide: 32.066 x 1 = 32.066

Step 4: Calculate the molecular weight of 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide by adding up the total weight of all atoms.

Molecular weight of 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide: 216.1926 (Carbon) + 16.128 (Hydrogen) + 70.9054 (Bromine) + 70.0337 (Nitrogen) + 32.066 (Sulfur) = 414.3243

So the molecular weight of 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide is 414.3243.

3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide [C₁₈H₁₆BrN₅S] Molecular Weight Calculation

REFERENCES:

• Lanl-1: https://periodic.lanl.gov/1.shtml 
• Jlab-ele006: https://education.jlab.org/itselemental/ele006.html
• Jlab-ele035: https://education.jlab.org/itselemental/ele035.html
  
• Jlab-ele007: https://education.jlab.org/itselemental/ele007.html
• Jlab-ele016: https://education.jlab.org/itselemental/ele016.html

See also:

• Hydrogen chloride molecular weight calculation