The molecular weight of Bromothymol Blue [C_{27}H_{28}Br_{2}O_{5}S] is 624.3839.

Bromothymol Blue (C_{27}H_{28}Br_{2}O_{5}S) 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 [C**_{27}H_{28}Br_{2}O_{5}S] Molecular Weight Calculation

_{27}H

_{28}Br

_{2}O

_{5}S] 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 C

_{27}H

_{28}Br

_{2}O

_{5}S. 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 [C_{27}H_{28}Br_{2}O_{5}S] Molecular Weight Calculation

Molecular weight of Bromothymol Blue [C_{27}H_{28}Br_{2}O_{5}S] | |||

Constituent atoms | Number of each atom | Atomic weight | Total weight |

Carbon (C) | 27 | 12.0107 | 324.2889 |

Hydrogen (H) | 28 | 1.008 | 28.224 |

Bromine (Br) | 2 | 79.904 | 159.808 |

Oxygen (O) | 5 | 15.9994 | 79.997 |

Sulfur (S) | 1 | 32.066 | 32.066 |

Molecular weight of Bromothymol Blue [C_{27}H_{28}Br_{2}O_{5}S]: | 624.3839 |

## 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