# Oxalic acid dihydrate (C2H2O4 · 2H2O) Molar Mass

Molar mass of Oxalic acid dihydrate (C2H2O4 · 2H2O) is 126.064 g/mol.

Well, now you have come to know the molar mass of C2H2O4 · 2H2O.

But how can you get this value?

Let me show you the calculation to get the molar mass of Oxalic acid dihydrate (C2H2O4 · 2H2O).

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

## Oxalic acid dihydrate (C2H2O4 · 2H2O) Molar Mass Calculation

If you have a periodic table with you, then you can easily calculate the molar mass of C2H2O4 · 2H2O.

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 Oxalic acid dihydrate (C2H2O4 · 2H2O).

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 C2H2O4 · 2H2O, there are Carbon atoms, Hydrogen atoms and Oxygen atoms.

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

You can see that;

The molar mass of Carbon is 12.011 g/mol. [1]

The molar mass of Hydrogen is 1.008 g/mol. [2]

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

Now, to calculate the molar mass of C2H2O4 · 2H2O, you just have to add the molar mass of all the individual atoms that are present in C2H2O4 · 2H2O.

So, Molar mass of C2H2O4 · 2H2O = {(Molar mass of Carbon atom × 2) + (Molar mass of Hydrogen atom × 2) + (Molar mass of Oxygen atom × 4)} + [2 × {(Molar mass of Hydrogen × 2) + Molar mass of Oxygen}]
= {(12.011 × 2) + (1.008 × 2) + (15.999 × 4)} + [2 × {(1.008 × 2) + 15.999}]
= {(24.022) + (2.016) + (63.996)} + [2 × {(2.016) + 15.999}]
= {90.034} + [2 × {18.015}]
= {90.034} + [36.03]
= 126.064 g/mol

Hence the Molar mass of C2H2O4 · 2H2O is 126.064 g/mol.

I hope you have understood the short and simple calculation for finding the molar mass of C2H2O4 · 2H2O.

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;
Vanillin (C8H8O3) Molar Mass
NaCO3 Molar Mass
Ag2CrO4 (Silver chromate) Molar Mass
Aluminum carbonate [Al2(CO3)3] Molar Mass
FeO Molar Mass

Author
##### Jay Rana

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.