The molecular weight of Disodium hydrogen arsenate (Na₂HAsO₄) is 185.90673356.

Disodium hydrogen arsenate [Na₂HAsO₄] is an inorganic compound of four elements: Sodium (Na), Hydrogen, Arsenic (As), and Oxygen (O). The molecular weight of Disodium hydrogen arsenate is 185.90673356 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: Disodium hydrogen arsenate [Na₂HAsO₄] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Disodium hydrogen arsenate molecule.
You will know different atoms and their number in a Disodium hydrogen arsenate molecule from the chemical formula. The chemical formula of Disodium hydrogen arsenate is Na₂HAsO₄. From the chemical formula, you can find that one molecule of Disodium hydrogen arsenate has two Sodium (Na) atoms, one Hydrogen (H) atom, 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 Hydrogen (H): 1.008 (Ref: Lanl-1)
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 Disodium hydrogen arsenate by adding the total weight of all atoms.

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

Number of Hydrogen atoms in Disodium hydrogen arsenate: 1
Atomic weight of Hydrogen (H): 1.008
Total weight of Hydrogen atoms in Disodium hydrogen arsenate: 1.008 x 1 = 1.008

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

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

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

Molecular weight of Disodium hydrogen arsenate : 45.97953856 (Sodium) + 1.008 (Hydrogen) + 74.921595 (Arsenic) + 63.9976 (Oxygen) = 185.90673356

So the molecular weight of Disodium hydrogen arsenate is 185.90673356.

Disodium hydrogen arsenate [Na₂HAsO₄] Molecular Weight Calculation

REFERENCES:

• Lanl-1: https://periodic.lanl.gov/1.shtml 
• 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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