The molecular weight of Actinium(III) phosphate [AcPO_{4}] is 321.971361998.

Actinium(III) phosphate (AcPO_{4}) is an inorganic compound of three elements: Actinium(III), Phosphorus, and Oxygen. The molecular weight of Actinium(III) phosphate is 321.971361998 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of Actinium, Phosphorus, and Oxygen.

**CALCULATION PROCEDURE: Actinium(III) phosphate [AcPO _{4}] Molecular Weight Calculation**

**Step 1: Find the chemical formula and determine constituent atoms and their number in an Actinium(III) phosphate molecule.**From the chemical formula, you will know different atoms and their number in an Actinium(III) phosphate molecule. The chemical formula of Actinium(III) phosphate is AcPO

_{4}. From the chemical formula, you can find that one molecule of Actinium(III) phosphate consists of one Actinium (Ac) atom, one Phosphorus (P) atom, and four Oxygen (O) atoms.

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

Atomic weight of Actinium (Ac): 227 (Ref: Jlab-ele089, Lanl-89, Nist-89)

Atomic weight of Phosphorus (P): 30.973761998 (Ref: Jlab-ele015)

Atomic weight of Oxygen (O): 15.9994 (Ref: Jlab-ele008)

**Step 3: Calculate the total weight of each atom present in an Actinium(III) phosphate molecule by multiplying its atomic weight by its number.**

Number of Actinium(III) atoms in Actinium(III) phosphate: 1

Atomic weight of Actinium(III): 227

Total weight of Actinium(III) atoms in Actinium(III) phosphate: 227 x 1 = 227

Number of Phosphorus atoms in Actinium(III) phosphate: 1

Atomic weight of Phosphorus (P): 30.973761998

Total weight of Phosphorus atoms in Actinium(III) phosphate: 30.973761998 x 1 = 30.973761998

Number of Oxygen atoms in Actinium(III) phosphate: 4

Atomic weight of Oxygen (O): 15.9994

Total weight of Oxygen atoms in Actinium(III) phosphate: 15.9994 x 4 = 63.9976

**Step 4: Calculate the molecular weight of Actinium(III) phosphate by adding up the total weight of all atoms. **

Molecular weight of Actinium(III) phosphate: 227 (Actinium(III)) + 30.973761998 (Phosphorus) + 63.9976 (Oxygen) = 321.971361998

So the molecular weight of Actinium(III) phosphate is 321.971361998.

Actinium(III) phosphate [AcPO_{4}] Molecular Weight Calculation

Molecular weight of Actinium(III) phosphate [AcPO_{4}] | |||

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

Actinium (Ac) | 1 | 227 | 227 |

Phosphorus (P) | 1 | 30.973761998 | 30.973761998 |

Oxygen (O) | 4 | 15.9994 | 63.9976 |

Molecular weight of Actinium(III) phosphate [AcPO_{4}]: | 321.971361998 |

## REFERENCES:

- Jlab-ele008: https://education.jlab.org/itselemental/ele008.html
- Jlab-ele089: https://education.jlab.org/itselemental/ele089.html
- Lanl-89: https://periodic.lanl.gov/89.shtml
- Nist-89: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=89
- Jlab-ele008: https://education.jlab.org/itselemental/ele008.html
- Jlab-ele015: https://education.jlab.org/itselemental/ele015.html