Hydrogen Fluoride (HF) Molecular Weight Calculation

The molecular weight of Hydrogen fluoride (HF) is 20.006403163.

Hydrogen fluoride Molecular Weight CalculationTo calculate molecular weight of any compound, the first step is to know the constituent elements (atoms) and their number in that particular compound. Now calculate the total atomic weight of each element by multiplying its atomic weight by its number. The sum of total atomic weight of all constituent elements will be the molecular weight of the compound. Note that the value of atomic weight may differ from different sources.

CALCULATION PROCEDURE

Step 1: Find out the chemical formula and determine constituent atoms and their number in a hydrogen fluoride molecule.
Hydrogen ChlorideWith the chemical formula, you will know different atoms and their number in a Hydrogen fluoride molecule. Chemical formula of Hydrogen fluoride is HF. From the chemical formula/structure of Hydrogen fluoride, it is easy to find out that there is one hydrogen (H) atom and one chlorine (Cl) atom in a molecule of Hydrogen fluoride.

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

Atomic weight of hydrogen (H): 1.008  (Ref: Lanl-1, Pubchem-Hydrogen)
Atomic weight of fluorine (F) : 18.998403163 (Ref: Pubchem-9, Ciaaw-fluorine)

Step 3: Calculate the total weight of each atom present in hydrogen fluoride. 

Formula:
Total weight of a atom in hydrogen fluoride: Atom’s atomic weight x total number of atoms in hydrogen fluoride

Number of hydrogen atoms in hydrogen fluoride: 1
Atomic weight of hydrogen: 1.008
Total weight of hydrogen atoms in hydrogen fluoride: 1.008

Number of oxygen atoms in hydrogen fluoride: 1
Atomic weight of fluoride: 18.998403163
Total weight of oxygen atoms in hydrogen fluoride: 18.998403163

Step 4: Calculate the molecular weight of hydrogen fluoride by adding total atomic weight of all atoms. 

Molecular weight of hydrogen fluoride (HF): 1.008 (hydrogen) + 18.998403163 (fluoride)

So the molecular weight of hydrogen fluoride is 20.006403163.

* Conventional atomic weight (You can also use standard stomic weight to calculate molecular weight of Hydrogen fluoride)

Molecular weight of Hydrogen fluoride (HF)
Atoms in hydrogen fluoride
Number of each atom in hydrogen fluoride
Atomic weight
Total weight
H (Hydrogen)11.0081.008 (1.008 x 1)
F (Fluoride)118.99840316318.998403163 (18.998403163 x 1)
Molecular weight of HF: 20.006403163

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