The molecular weight of Sodium dihydrogen arsenate monohydrate (NaH₂AsO₄.H₂O) is 181.94036428.

Sodium dihydrogen arsenate [NaH₂AsO₄] is an inorganic compound of four elements: Sodium (Na), Hydrogen, Arsenic (As), and Oxygen (O). The monohydrate form of Sodium dihydrogen arsenate [NaH₂AsO₄.H₂O] also contains one water (H₂O) molecule. The molecular weight of Sodium dihydrogen arsenate monohydrate is 181.94036428 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements and water molecule.

CALCULATION PROCEDURE: Sodium dihydrogen arsenate monohydrate [NaH₂AsO₄.H2O] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Sodium dihydrogen arsenate monohydrate molecule.
You will know different atoms and their number in a Sodium dihydrogen arsenate monohydrate molecule from the chemical formula. The chemical formula of Sodium dihydrogen arsenate monohydrate is NaH₂AsO₄.H₂O. From the chemical formula, you can find that one molecule of Sodium dihydrogen arsenate monohydrate has one Sodium (Na) atom, two Hydrogen (H) atoms, one Arsenic (As) atom, four Oxygen (O) atoms, and one Water molecule.

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)
Molecular weight of Water [H₂O]: 18.0154

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

Number of Sodium (Na) atoms in Sodium dihydrogen arsenate monohydrate: 1
Atomic weight of Sodium: 22.98976928
Total weight of Sodium atoms in Sodium dihydrogen arsenate monohydrate: 22.98976928 x 1 = 22.98976928

Number of Hydrogen atoms in Sodium dihydrogen arsenate monohydrate: 2
Atomic weight of Hydrogen (H): 1.008
Total weight of Hydrogen atoms in Sodium dihydrogen arsenate monohydrate: 1.008 x 2 = 2.016

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

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

Number of water (H₂O) molecules in Calcium chloride monohydrate: 1
Molecular weight of water: 18.0154
Total weight of water in Calcium chloride monohydrate: 18.0154 x 1 = 18.0154

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

Molecular weight of Sodium dihydrogen arsenate monohydrate: 22.98976928 (Sodium) + 2.16 (Hydrogen) + 74.921595 (Arsenic) + 63.9976 (Oxygen) + 18.0154 (Water) = 181.94036428

So the molecular weight of Sodium dihydrogen arsenate monohydrate is 181.94036428.

Sodium dihydrogen arsenate monohydrate [NaH₂AsO₄.H₂O] 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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