Magnesium Sulfate [MgSO4] Molecular Weight Calculation

The molecular weight of Magnesium sulfate (MgSO4) is 120.3686.

Magnesium sulfate (MgSO4) is an inorganic compound of three elements: Magnesium, Sulfur, and Oxygen. The molecular weight of Magnesium sulfate is 120.3686 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

CALCULATION PROCEDURE: Magnesium sulfate [MgSO4] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in a Magnesium sulfate molecule.
You will know different atoms and their number in a Magnesium sulfate molecule from the chemical formula. The chemical formula of Magnesium sulfate is MgSO4. From the chemical formula, you can find that one molecule of Magnesium sulfate has one Magnesium (Mg) atom, one Sulfur (S) atom, and four Oxygen (O) atoms.

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

Atomic weight of Magnesium (Mg): 24.305 (Ref: Jlab-ele012)
Atomic weight of
Sulfur (S): 32.066 (Ref: Jlab-ele016)
Atomic weight of Oxygen (O): 15.9994 (Ref: Jlab-ele008)

Step 3: Calculate the molecular weight of Magnesium sulfate by adding the total weight of all atoms.

Number of Magnesium atoms in Magnesium sulfate: 1
Atomic weight of Magnesium: 24.305
Total weight of Magnesium atoms in Magnesium sulfate: 24.305 x 1 = 24.305

Number of Sulfur (S) atoms in Magnesium sulfate: 1
Atomic weight of Sulfur: 32.066
Total weight of Sulfur atoms in Magnesium sulfate: 32.066 x 1 = 32.066

Number of Oxygen (O) atoms in Magnesium sulfate: 4
Atomic weight of Oxygen: 15.9994
Total weight of Oxygen atoms in Magnesium sulfate: 15.9994 x 4 = 63.9976

Step 4: Calculate the molecular weight of Magnesium sulfate by adding up the total weight of all atoms.

Molecular weight of Magnesium sulfate : 24.305 (Magnesium) + 32.066 (Sulfur) + 63.9976 (Oxygen) = 120.3686

So the molecular weight of Magnesium sulfate is 120.3686.

Magnesium sulfate [MgSO4] Molecular Weight Calculation

REFERENCES:

• Jlab-ele012: https://education.jlab.org/itselemental/ele012.html
• Jlab-ele016: https://education.jlab.org/itselemental/ele016.html
• Jlab-ele008: https://education.jlab.org/itselemental/ele008.html