The molecular weight of Potassium sulfate (K_{2}SO_{4}) is 174.2602.

Potassium sulfate (K_{2}SO_{4}) is an inorganic compound of three elements: Potassium, Sulfur, and Oxygen. The molecular weight of Potassium sulfate is 174.2602 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of Potassium, Sulfur and Oxygen.

**CALCULATION PROCEDURE: Potassium sulfate [K**_{2}SO_{4}] Molecular Weight Calculation

_{2}SO

_{4}] Molecular Weight Calculation

**Step 1: Find out the chemical formula and determine constituent atoms and their number in a Potassium sulfate molecule. **You will know different atoms and their number in a Potassium sulfate molecule from the chemical formula. The chemical formula of Potassium sulfate is K

_{2}SO

_{4}. From the chemical formula, you can find that one molecule of Potassium sulfate has two Potassium (K) atoms, 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 Potassium (K): 39.0983 (Ref: Ciaaw-potassium)

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 Potassium sulfate by adding the total weight of all atoms. **

Number of Potassium atoms in Potassium sulfate: 2

Atomic weight of Potassium: 39.0983

Total weight of Potassium atoms in Potassium sulfate: 39.0983 x 2 = 78.1966

Number of Sulfur (S) atoms in Potassium sulfate: 1

Atomic weight of Sulfur: 32.066

Total weight of Manganese atoms in Potassium sulfate: 32.066 x 1 = 32.066

Number of Oxygen (O) atoms in Potassium sulfate: 4

Atomic weight of Oxygen: 15.9994

Total weight of Oxygen atoms in Potassium sulfate: 15.9994 x 4 = 63.9976

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

Molecular weight of Potassium sulfate : 78.1966 (Potassium) + 32.066 (Sulfur) + 63.9976 (Oxygen)

So the molecular weight of Potassium sulfate is 174.2602.

Potassium sulfate [K_{2}SO_{4}] Molecular Weight Calculation

Molecular weight of Potassium sulfate (K_{2}SO_{4}) | |||

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

Potassium (K) | 2 | 39.0983 | 78.1966 |

Sulfur (S) | 1 | 32.066 | 32.066 |

Oxygen (O) | 4 | 15.9994 | 63.9976 |

Molecular weight of Potassium sulfate (K_{2}SO_{4}): | 174.2602 |

## REFERENCES:

- Ciaaw-potassium: https://www.ciaaw.org/potassium.htm
- Jlab-ele016: https://education.jlab.org/itselemental/ele016.html
- Jlab-ele008: https://education.jlab.org/itselemental/ele008.html