The molecular weight of Disodium methylarsonate [CH₃AsNa₂O₃] is 183.93403356.

Disodium methylarsonate [CH₃AsNa₂O₃] is an organic compound of five elements: Carbon (C), Hydrogen (H), Arsenic (As), Sodium (Na), and Oxygen (O). The molecular weight of Disodium methylarsonate is 183.93403356 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of  Carbon, Hydrogen, Arsenic, Sodium, and Oxygen.

CALCULATION PROCEDURE: Disodium methylarsonate [CH₃AsNa₂O₃] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Disodium methylarsonate molecule.
You will know different atoms and their number in a Disodium methylarsonate molecule from the chemical formula. The chemical formula of Disodium methylarsonate is [CH₃AsNa₂O₃]. From the chemical formula, you can find that one molecule of Disodium methylarsonate has one Carbon (C) atom, three Hydrogen (H) atoms, one Arsenic (As) atom, two Sodium (Na) atoms, and three Oxygen (O) 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)
Atomic weight of Arsenic (As): 74.921595 (Ref: Jlab-ele033, ciaaw-arsenic)
Atomic weight of Sodium (Na): 22.98976928 (Ref: Ciaaw-sodium)
Atomic weight of Oxygen (O): 15.9994 (Ref: Jlab-ele008)

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

Number of Carbon atoms in Disodium methylarsonate: 1
Atomic weight of Carbon (C): 12.0107
Total weight of Carbon atoms in Disodium methylarsonate: 12.0107 x 1 = 12.0107

Number of Hydrogen atoms in Disodium methylarsonate: 3
Atomic weight of Hydrogen (H): 1.008
Total weight of Hydrogen atoms in Disodium methylarsonate: 1.008 x 3 = 3.024

Number of Arsenic atoms in Disodium methylarsonate: 1
Atomic weight of Arsenic (As): 74.921595
Total weight of Arsenic atoms in Disodium methylarsonate: 74.921595 x 1 = 74.921595

Number of Sodium atoms in Disodium methylarsonate: 2
Atomic weight of Sodium (Na): 22.98976928
Total weight of Arsenic atoms in Disodium methylarsonate: 22.98976928 x 2 = 45.97953856

Number of Oxygen atoms in Disodium methylarsonate: 3
Atomic weight of Oxygen (O): 15.9994
Total weight of Oxygen atoms in Disodium methylarsonate: 15.9994 x 3 = 47.9982

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

Molecular weight of Disodium methylarsonate: 12.0107 (Carbon) + 3.024 (Hydrogen) + 74.921595 (Arsenic) + 45.97953856 (Sodium) + 47.9982 (Oxygen) = 183.93403356

So the molecular weight of Disodium methylarsonate is 183.93403356.

Disodium methylarsonate [CH₃AsNa₂O₃] Molecular Weight Calculation

REFERENCES:

• Lanl-1: https://periodic.lanl.gov/1.shtml 
• Jlab-ele006; https://education.jlab.org/itselemental/ele006.html
• Jlab-ele008: https://education.jlab.org/itselemental/ele008.html
• Jlab-ele033: https://education.jlab.org/itselemental/ele033.html
• ciaaw-arsenic: https://www.ciaaw.org/arsenic.htm
• Ciaaw-sodium: https://www.ciaaw.org/sodium.htm
  

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• Arsenic Tribromide [AsBr₃] Molecular Weight Calculation
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