HgO Molar Mass (With Calculations)

HgO Molar Mass

Molar mass of HgO is 216.589 g/mol.

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

But how can you get this value?

Let me show you the calculation to get the molar mass of HgO.

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

HgO Molar Mass Calculation

If you have a periodic table with you, then you can easily calculate the molar mass of HgO.

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 HgO.

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 HgO, there is 1 Mercury atom and 1 Oxygen atom.

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

You can see that;

The molar mass of Mercury is 200.59 g/mol. [1]

The molar mass of Oxygen is 15.999 g/mol. [2]

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

You can see that in HgO, there is 1 Mercury atom and 1 Oxygen atom.

So, Molar mass of HgO = Molar mass of 1 Mercury (Hg) atom + Molar mass of 1 Oxygen (O) atom.
= 200.59 + 15.999
= 216.589 g/mol

Hence the Molar mass of HgO is 216.589 g/mol.

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


  • 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;
Naphthalene (C10H8) Molar Mass
Ammonium carbonate [(NH4)2CO3] Molar Mass
CaF2 (Calcium fluoride) Molar Mass
Hydrogen iodide (HI) Molar Mass
C2H2 (Ethyne) 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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