SO3 (Sulfur trioxide) Molar Mass (With Calculations)

Molar mass of SO3 (Sulfur trioxide) is 80.057 g/mol.

Well, now you have come to know the molar mass of SO3.

But how can you get this value?

Let me show you the calculation to get the molar mass of SO3 (Sulfur trioxide).

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

SO3 (Sulfur trioxide) Molar Mass Calculation

If you have a periodic table with you, then you can easily calculate the molar mass of SO3 (Sulfur trioxide).

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 SO3 (Sulfur trioxide).

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 SO3, there is 1 Sulfur atom and 3 Oxygen atoms.

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

You can see that;

The molar mass of Sulfur is 32.06 g/mol. ^[1]

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

Now, to calculate the molar mass of SO3, you just have to add the molar mass of all the individual atoms that are present in SO3.

You can see that in SO3, there is 1 Sulfur atom and 3 Oxygen atoms.

So, Molar mass of SO3 = Molar mass of 1 Sulfur (S) atom + Molar mass of 3 Oxygen (O) atoms.
= 32.06 + (15.999) 3
= 32.06 + 47.997
= 80.057 g/mol

Hence the Molar mass of SO3 is 80.057 g/mol.

I hope you have understood the short and simple calculation for finding the molar mass of SO3.

Remember

• 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;
BaCl2 (Barium chloride) Molar Mass
CaO (Calcium oxide) Molar Mass
Chlorine pentafluoride (ClF5) Molar Mass
LiCl (Lithium chloride) Molar Mass
Heptane (C7H16) Molar Mass