PCl5 (Phosphorus pentachloride) Molar Mass

PCl5 (Phosphorus pentachloride) Molar Mass

Molar mass of PCl5 (Phosphorus pentachloride) is 208.224 g/mol.

Well, now you have come to know the molar mass of PCl5.

But how can you get this value?

Let me show you the calculation to get the molar mass of PCl5 (Phosphorus pentachloride).

You can also refer to this one minute video which will show you the simple steps to calculate the molar mass of any compounds.

PCl5 (Phosphorus pentachloride) Molar Mass Calculation

If you have a periodic table with you, then you can easily calculate the molar mass of PCl5 (Phosphorus pentachloride).

Because the molar mass of any molecule (or compound) can be calculated by simply adding the molar masses of individual atoms.

Now here we have to find the molar mass of PCl5 (Phosphorus pentachloride).

So for that, have a look at the periodic table given below.

You can see the molar mass value of all the atoms from this periodic table.

Now in PCl5, there is 1 Phosphorus atom and 5 Chlorine atoms.

So let’s look at the molar mass of Phosphorus and Chlorine from the above periodic table.

You can see that;

The molar mass of Phosphorus is 30.974 g/mol. [1]

The molar mass of Chlorine is 35.45 g/mol. [2]

Now, to calculate the molar mass of PCl5, you just have to add the molar mass of all the individual atoms that are present in PCl5.

You can see that in PCl5, there is 1 Phosphorus atom and 5 Chlorine atoms.

So, Molar mass of PCl5 = Molar mass of 1 Phosphorus (P) atom + Molar mass of 5 Chlorine (Cl) atoms.
= 30.974 + (35.45) 5
= 30.974 + 177.25
= 208.224 g/mol

Hence the Molar mass of PCl5 is 208.224 g/mol.

I hope you have understood the short and simple calculation for finding the molar mass of PCl5.


  • In some books, you may see the unit of molar mass as grams/mole or g/mole. But all these units (i.e g/mol, grams/mole and g/mole) are the same. 
  • Always follow the calculation order to avoid any mistakes in calculation. First solve the brackets, then multiplications and at last do the final addition.
  • And don’t forget to put the unit g/mol to your final calculated molar mass.

Check out other related topics for more practice;
CuNO3 Molar Mass
Dichloromethane (CH2Cl2) Molar Mass
MgF2 (Magnesium fluoride) Molar Mass
Sulfate ion (SO4)2- Molar Mass
Nitroglycerin (C3H5N3O9) Molar Mass


Jay is an educator and has helped more than 100,000 students in their studies by providing simple and easy explanations on different science-related topics. With a desire to make learning accessible for everyone, he founded Knords Learning, an online learning platform that provides students with easily understandable explanations.

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