The molecular weight of Sodium arsenate (Na₃AsO₄) is 207.88850284.

Sodium arsenate [Na₃AsO₄] is an inorganic compound of three elements: Sodium (Na), Arsenic (As), and Oxygen (O). The molecular weight of Sodium arsenate is 207.88850284 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: Sodium arsenate [Na₃AsO₄] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Sodium arsenate molecule.
You will know different atoms and their number in a Sodium arsenate molecule from the chemical formula. The chemical formula of Sodium arsenate is Na₃AsO₄. From the chemical formula, you can find that one molecule of Sodium arsenate has three Sodium (Na) atoms, one Arsenic (As) atom, and four Oxygen (O) atoms.

Step 2: Find out the atomic weights of each atom (from the periodic table).

Atomic weight of Sodium (Na): 22.98976928 (Ref: Ciaaw-sodium)
Atomic weight of Arsenic (As): 74.921595 (Ref: Jlab-ele033, ciaaw-arsenic)
Atomic weight of Oxygen (O): 15.9994 (Ref: Jlab-ele008)

Step 3: Calculate the molecular weight of Sodium arsenate by adding the total weight of all atoms.

Number of Sodium (Na) atoms in Sodium arsenate: 3
Atomic weight of Sodium: 22.98976928
Total weight of Sodium atoms in Sodium arsenate: 22.98976928 x 3 = 68.96930784

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

Number of Oxygen (O) atoms in Sodium arsenate: 4
Atomic weight of Oxygen: 15.9994
Total weight of Oxygen atoms in Sodium arsenate: 15.9994 x 4 = 63.9976

Step 4: Calculate the molecular weight of Sodium arsenate by adding up the total weight of all atoms.

Molecular weight of Sodium arsenate : 68.96930784 (Sodium) + 74.921595 (Arsenic) + 63.9976 (Oxygen) = 207.88850284

So the molecular weight of Sodium arsenate is 207.88850284.

Sodium arsenate [Na₃AsO₄] Molecular Weight Calculation

REFERENCES:

• Ciaaw-sodium : https://www.ciaaw.org/sodium.htm
• Jlab-ele033: https://education.jlab.org/itselemental/ele033.html
  
• ciaaw-arsenic: https://www.ciaaw.org/arsenic.htm
  
• Jlab-ele008: https://education.jlab.org/itselemental/ele008.html

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