Question

Calculate the molecular mass of the following:- Feso4. 7H₂O​

Answer 1

ANSWER = This way you can calculate molar masses of all other molecules. Molar mass of FeSO4 7H2O is, A powder contains FeSO4 7H2O (molar mass )= 278 g.

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Answer 2

Explanation:

Given -

• Compound FeSO4.7H2O

To Find -

• Molecular mass of FeSO4.7H2O

Molecular mass of FeSO4.7H2O is

→ 55 + 32 + 16×4 + 7(1×2+16)

→ 55 + 32 + 64 + 7(18)

→ 55 + 32 + 64 + 126

→ 277 g/mol

Hence,

The molar mass of FeSO4.7H2O is 277 g/mol.

Additional information :-

☞ Iron sulphate crystals contain 7 molecules of water of crystallisation per formula unit and hence written as FeSO4.7H2O

☞ It is also called iron sulphate Heptahydrate.

☞ The water molecules which form part of the structure of a crystal are called water of crystallisation.

☞ FeSO4.7H2O is green in colour.

☞ When Iron sulphate crystals are heated then they loses water of Crystallisation and form anhydrous iron sulphate

Chemical equation :-

• FeSO4.7H2O → FeSO4 + 7H2O

☞ When water molecules is added to anhydrous iron sulphate then it regains its colour.

Chemical equation :-

• FeSO4 + 7H2O → FeSO4.7H2O