How many moles of FeSO4 are there in a 0.1M solution of FESO4.7H2O?

A 0.1 M solution means:

0.1 moles of FeSO₄·7H₂O per liter of solution

Key Concept:

• FeSO₄·7H₂O is a hydrated salt, but it still contains 1 mole of FeSO₄ per mole of FeSO₄·7H₂O
• Water of crystallization does not change the mole ratio of FeSO₄

So:

• 1 mole of FeSO₄·7H₂O → 1 mole of FeSO₄
• Therefore,

0.1 M FeSO₄·7H₂O = 0.1 moles of FeSO₄ per liter

Final Answer:

0.1 moles of FeSO₄ per liter

Key Takeaway:

Hydrated salts give the same number of moles of the main compound, so 0.1 M FeSO₄·7H₂O provides 0.1 moles of FeSO₄.