Ammonium dichromate [(NH4)2Cr2O7] Molar Mass (With Calculations)

Ammonium dichromate [(NH4)2Cr2O7] Molar Mass

Molar mass of Ammonium dichromate [(NH4)2Cr2O7] is 252.063 g/mol.

Well, now you have come to know the molar mass of [(NH4)2Cr2O7].

But how can you get this value?

Let me show you the calculation to get the molar mass of [(NH4)2Cr2O7] (or Ammonium dichromate).

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

Ammonium dichromate [(NH4)2Cr2O7] Molar Mass Calculation

If you have a periodic table with you, then you can easily calculate the molar mass of Ammonium dichromate [(NH4)2Cr2O7].

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 Ammonium dichromate [(NH4)2Cr2O7].

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 [(NH4)2Cr2O7], there are Nitrogen atoms, Hydrogen atoms, Chromium atom and Oxygen atoms.

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

You can see that;

The molar mass of Nitrogen is 14.007 g/mol. [1]

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

The molar mass of Chromium is 51.996 g/mol. [3]

The molar mass of Oxygen is 15.999 g/mol. [4]

Now, to calculate the molar mass of [(NH4)2Cr2O7], you just have to add the molar mass of all the individual atoms that are present in [(NH4)2Cr2O7].

So, Molar mass of Ammonium dichromate [(NH4)2Cr2O7] = [{Molar mass of Nitrogen atom + (Molar mass of Hydrogen atom × 4)} × 2] + {(Molar mass of Chromium atom × 2) + (Molar mass of Oxygen atom × 7)}
= [{14.007 + (1.008 × 4)} × 2] + {(51.996 × 2) + (15.999 × 7)}
= [{14.007 + (4.032)} × 2] + {(103.992) + (111.993)}
= [{18.039} × 2] + {215.985}
= [36.078] + {215.985}
= 252.063 g/mol

Hence the Molar mass of [(NH4)2Cr2O7] is 252.063 g/mol.

I hope you have understood the short and simple calculation for finding the molar mass of [(NH4)2Cr2O7].


  • 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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BaCl2 · 2H2O Molar Mass
Stearic acid (C18H36O2) 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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