Na2SO4 (Sodium sulfate) Molar Mass (With Calculations)

Na2SO4 (Sodium sulfate) Molar Mass

Molar mass of Na2SO4 (Sodium sulfate) is 142.036 g/mol.

Well, now you have come to know the molar mass of Na2SO4.

But how can you get this value?

Let me show you the calculation to get the molar mass of Na2SO4 (Sodium sulfate).

If you are a visual learner like me, then here is a short one minute video for you.

Na2SO4 (Sodium sulfate) Molar Mass Calculation

If you have a periodic table with you, then you can easily calculate the molar mass of Na2SO4 (Sodium sulfate).

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 Na2SO4 (Sodium sulfate).

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 Na2SO4, there are 2 Sodium atoms, 1 Sulfur atom and 4 Oxygen atoms.

So let’s look at the molar mass of Sodium, Sulfur and Oxygen from the above periodic table.

You can see that;

The molar mass of Sodium is 22.990 g/mol. [1]

The molar mass of Sulfur is 32.06 g/mol. [2]

The molar mass of Oxygen is 15.999 g/mol. [3]

Now, to calculate the molar mass of Na2SO4, you just have to add the molar mass of all the individual atoms that are present in Na2SO4.

You can see that in Na2SO4, there are 2 Sodium atoms, 1 Sulfur atom and 4 Oxygen atoms.

So, Molar mass of Na2SO4 = Molar mass of 2 Sodium (Na) atoms + Molar mass of 1 Sulfur (S) atom + Molar mass of 4 Oxygen (O) atoms.
= (22.990) 2 + 32.06 + (15.999) 4
= 45.98 + 32.06 + 63.996
= 142.036 g/mol

Hence the Molar mass of Na2SO4 is 142.036 g/mol.

I hope you have understood the short and simple calculation for finding the molar mass of Na2SO4.


  • 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;
KF Molar Mass
NaNO3 (Sodium nitrate) Molar Mass
AgNO3 (Silver nitrate) Molar Mass
KClO3 (Potassium chlorate) Molar Mass
NO2 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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