The molecular weight of Sodium dihydrogen arsenate (NaH_{2}AsO_{4}) is 163.92496428.

Sodium dihydrogen arsenate [NaH_{2}AsO_{4}] is an inorganic compound of four elements: Sodium (Na), Hydrogen, Arsenic (As), and Oxygen (O). The molecular weight of Sodium dihydrogen arsenate is 163.92496428 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

**CALCULATION PROCEDURE: Sodium dihydrogen arsenate [NaH**_{2}AsO_{4}] Molecular Weight Calculation

_{2}AsO

_{4}] Molecular Weight Calculation

**Step 1: Find out the chemical formula and determine constituent atoms and their number in a Sodium dihydrogen arsenate molecule. **You will know different atoms and their number in a Sodium dihydrogen arsenate molecule from the chemical formula. The chemical formula of Sodium dihydrogen arsenate is NaH

_{2}AsO

_{4}. From the chemical formula, you can find that one molecule of Sodium dihydrogen arsenate has one Sodium (Na) atom, two Hydrogen (H) 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 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 Sodium dihydrogen arsenate by adding the total weight of all atoms. **

Number of Sodium (Na) atoms in Sodium dihydrogen arsenate: 1

Atomic weight of Sodium: 22.98976928

Total weight of Sodium atoms in Sodium dihydrogen arsenate: 22.98976928 x 1 = 22.98976928

Number of Hydrogen atoms in Sodium dihydrogen arsenate: 2

Atomic weight of Hydrogen (H): 1.008

Total weight of Hydrogen atoms in Sodium dihydrogen arsenate: 1.008 x 2 = 2.016

Number of Arsenic (As) atoms in Sodium dihydrogen arsenate: 1

Atomic weight of Arsenic: 74.921595

Total weight of Arsenic atoms in Sodium dihydrogen arsenate: 74.921595 x 1 = 74.921595

Number of Oxygen (O) atoms in Sodium dihydrogen arsenate: 4

Atomic weight of Oxygen: 15.9994

Total weight of Oxygen atoms in Sodium dihydrogen arsenate: 15.9994 x 4 = 63.9976

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

Molecular weight of Sodium dihydrogen arsenate : 22.98976928 (Sodium) + 2.016 (Hydrogen) + 74.921595 (Arsenic) + 63.9976 (Oxygen) = 163.92496428

Therefore the molecular weight of Sodium dihydrogen arsenate is 163.92496428.

Sodium dihydrogen arsenate [NaH_{2}AsO_{4}] Molecular Weight Calculation

Molecular weight of Sodium dihydrogen arsenate (NaH_{2}AsO_{4}) | |||

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

Sodium (Na) | 1 | 22.98976928 | 22.98976928 |

Hydrogen (H) | 2 | 1.008 | 2.016 |

Arsenic (As) | 1 | 74.921595 | 74.921595 |

Oxygen (O) | 4 | 15.9994 | 63.9976 |

Molecular weight of Sodium dihydrogen arsenate (NaH_{2}AsO_{4}): | 163.92496428 |

## 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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