The molecular weight of Bromothymol Blue [C₂₇H₂₈Br₂O₅S] is 624.3839.

Bromothymol Blue (C₂₇H₂₈Br₂O₅S) is an organic compound of five elements: Carbon, Hydrogen, Bromine, Oxygen, and Sulfur. The molecular weight of Bromothymol Blue is 624.3839 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: Bromothymol Blue  [C₂₇H₂₈Br₂O₅S] Molecular Weight Calculation

Step 1: Find the chemical formula and determine constituent atoms and their number in a Bromothymol Blue molecule.
You will know different atoms and their number in a Bromothymol Blue molecule from the chemical formula. The chemical formula of Bromothymol Blue is C₂₇H₂₈Br₂O₅S. From the chemical formula, you can find that one molecule of Bromothymol Blue consists of twenty-seven Carbon (C) atoms, twenty-eight Hydrogen (H) atoms, two Bromine (Br) atoms, five Oxygen atoms, and one Sulfur (S) 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 Oxygen (O): 15.9994 (Ref: Jlab-ele008)
Atomic weight of Sulfur (S): 32.066 (Ref: Jlab-ele016)

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

Number of Carbon atoms in Bromothymol Blue: 27
Atomic weight of Carbon (C): 12.0107
Total weight of Carbon atoms in Bromothymol Blue: 12.0107 x 27 = 324.2889

Number of Hydrogen atoms in Bromothymol Blue: 28
Atomic weight of Hydrogen (H): 1.008
Total weight of Hydrogen atoms in Bromothymol Blue: 1.008 x 28 = 28.224

Number of Bromine atoms in Bromothymol Blue: 2
Atomic weight of Bromine (Br): 79.904
Total weight of Bromine atoms in Bromothymol Blue: 79.904 x 2 = 159.808

Number of Oxygen atoms in Bromothymol Blue: 5
Atomic weight of Oxygen (O): 15.9994
Total weight of Oxygen atoms in Bromothymol Blue: 15.9994 x 5 = 79.997

Number of Sulfur atoms in Bromothymol Blue: 1
Atomic weight of Sulfur (S): 32.066
Total weight of Sulfur atoms in Bromothymol Blue: 32.066 x 1 = 32.066

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

Molecular weight of Bromothymol Blue: 324.2889 (Carbon) + 28.224 (Hydrogen) + 159.808 (Bromine) + 79.997 (Oxygen) + 32.066 (Sulfur) = 624.3839

So the molecular weight of Bromothymol Blue is 624.3839.

Bromothymol Blue [C₂₇H₂₈Br₂O₅S] 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.htm
  
• Jlab-ele008: https://education.jlab.org/itselemental/ele008.html
• Jlab-ele016: https://education.jlab.org/itselemental/ele016.html
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See also:

• Hydrogen chloride molecular weight calculation