# Calcium Arsenate [Ca3(AsO4)2] Molecular Weight Calculation

The molecular weight of Calcium arsenate [Ca3(AsO4)2] is 398.07239.

Calcium arsenate [Ca3(AsO4)2] is an inorganic compound of three elements: Calcium (Ca), Arsenic (As), and Oxygen (O). The molecular weight of Calcium arsenate is 398.07239 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of Calcium, Arsenic, and Oxygen.

# CALCULATION PROCEDURE: Calcium arsenate [Ca3(AsO4)2] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Calcium arsenate molecule.
You will know different atoms and their number in a Calcium arsenate molecule from the chemical formula. The chemical formula of Calcium arsenate is Ca3(AsO4)2. From the chemical formula, you can find that one molecule of Calcium arsenate has three Calcium (Ca) atoms, two Arsenic (As) atoms, and eight Oxygen (O) atoms.

Step 2: Find out the atomic weights of each atom (from the periodic table).
Atomic weight of Calcium (Ca): 40.078 (Ref: PubChem-20, Ciaaw-calcium)
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 total weight of each atom in a Calcium arsenate molecule by multiplying its atomic weight by its number.

Number of Calcium atoms in Calcium arsenate: 3
Atomic weight of Calcium (Ca): 40.078
Total weight of Calcium atoms in Calcium arsenate: 40.078 x 3 = 120.234

Number of Arsenic atoms in Calcium arsenate: 2
Atomic weight of Arsenic (As): 74.921595
Total weight of Arsenic atoms in Calcium arsenate: 74.921595 x 2 = 149.84319

Number of Oxygen atoms in Calcium arsenate: 8
Atomic weight of Oxygen (O): 15.9994
Total weight of Oxygen atoms in Calcium arsenate: 15.9994 x 8 = 127.9952

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

Molecular weight of Calcium arsenate: 120.234 (Calcium) + 149.84319 (Arsenic) + 127.9952 (Oxygen) = 398.07239

So the molecular weight of Calcium arsenate is 398.07239.

Calcium arsenate [Ca3(AsO4)2] Molecular Weight Calculation

## REFERENCES:

• PubChem-20: https://pubchem.ncbi.nlm.nih.gov/element/20
• Ciaaw-calcium: https://www.ciaaw.org/calcium.htm
• Jlab-ele008: https://education.jlab.org/itselemental/ele008.html
• Jlab-ele033: https://education.jlab.org/itselemental/ele033.html
• https://www.ciaaw.org/arsenic.htm

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