The molecular weight of Actinium(III) Nitrate [Ac(NO₃)₃] is 413.01482.

Actinium(III) nitrate [Ac(NO₃)₃] is an inorganic compound of three elements: Actinium(III), Nitrogen, and Oxygen. The molecular weight of Actinium(III) nitrate is 413.01482 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of Actinium(III), Nitrogen, and Oxygen.

CALCULATION PROCEDURE: Actinium(III) Nitrate [Ac(NO₃)₃] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in an Actinium(III) nitrate molecule.
From the chemical formula, you will know different atoms and their number in an Actinium(III) nitrate molecule. The chemical formula of Actinium(III) nitrate is Ac(NO₃)₃. From the chemical formula, you can find that one molecule of Actinium(III) nitrate has one Actinium(III) (Ac) atom, three Nitrogen (N) atoms, and nine 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 Nitrogen (N): 14.00674 (Ref: Jlab-ele007)
Atomic weight of Oxygen (O): 15.9994 (Ref: Jlab-ele008)

Step 3: Calculate the molecular weight of Actinium(III) nitrate by adding the total weight of all atoms.

Number of Actinium (Ac) atoms in Actinium(III) nitrate: 1
Atomic weight of Actinium: 227
Total weight of Actinium atoms in Actinium(III) nitrate: 227 x 1 = 227

Number of Nitrogen (N) atoms in Actinium(III) nitrate: 3
Atomic weight of Nitrogen: 14.00674
Total weight of Nitrogen atoms in Actinium(III) nitrate: 14.00674 x 3 = 42.02022

Number of Oxygen (O) atoms in Actinium(III) nitrate: 9
Atomic weight of Oxygen: 15.9994
Total weight of Oxygen atoms in Actinium(III) nitrate: 15.9994 x 9 = 143.9946

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

Molecular weight of Actinium(III) nitrate [Ac(NO₃)₃]: 227 (Actinium(III)) + 42.02022 (Nitrogen) + 143.9946 (Oxygen) = 413.01482

So the molecular weight of Actinium(III) nitrate is 413.01482.

Actinium(III) Nitrate [Ac(NO₃)₃] Molecular Weight Calculation

REFERENCES:

• Jlab-ele007: https://education.jlab.org/itselemental/ele007.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 

See also:

• Nitrogen nitrate molecular weight calculation

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