K2CO3 (Potassium carbonate) Molar Mass (With Calculations)

K2CO3 (Potassium carbonate) Molar Mass

Molar mass of Potassium carbonate (K2CO3) is 138.204 g/mol.

Well, now you have come to know the molar mass of K2CO3.

But how can you get this value?

Let me show you the calculation to get the molar mass of K2CO3 (Potassium carbonate).

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

K2CO3 (Potassium carbonate) Molar Mass Calculation

If you have a periodic table with you, then you can easily calculate the molar mass of K2CO3 (Potassium carbonate).

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 K2CO3 (Potassium carbonate).

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 K2CO3, there are 2 Potassium atoms, 1 Carbon atom and 3 Oxygen atoms.

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

You can see that;

The molar mass of Potassium is 39.098 g/mol. [1]

The molar mass of Carbon is 12.011 g/mol. [2]

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

Now, to calculate the molar mass of K2CO3, you just have to add the molar mass of all the individual atoms that are present in K2CO3.

You can see that in K2CO3, there are 2 Potassium atoms, 1 Carbon atom and 3 Oxygen atoms.

So, Molar mass of K2CO3 = Molar mass of 2 Potassium (K) atoms + Molar mass of 1 Carbon (C) atom + Molar mass of 3 Oxygen (O) atoms.
= (39.098) 2 + 12.011 + (15.999) 3
= 78.196 + 12.011 + 47.997
= 138.204 g/mol

Hence the Molar mass of K2CO3 is 138.204 g/mol.

I hope you have understood the short and simple calculation for finding the molar mass of K2CO3.


  • 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;
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AlCl3 (Aluminum chloride) Molar Mass
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Aluminum hydroxide [Al(OH)3] Molar Mass
H2S 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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