Problem: How many Fe(II) ions are there in 20.00 g of FeSO 4?

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FREE Expert Solution

For this problem, we’re being asked to determine the number of Fe (II) ions in 20.0 g FeSO4


Recall that FeSO4 dissociates into Fe2+ and SO42- in the reaction:

FeSO4 →  Fe2+ + SO42-


The reaction tells us that 1 mol of FeSO4 gives 1 mol of Fe2+ ion and 1 mol of SO42-


**Recall that Fe (II) is the same as Fe2+


If we have 20.00 grams of FeSO4, we can find the number of ions of Fe(II) using 
molar mass of FeSO4, and stoichiometric relationship from the balanced equation, and Avogadro’s number.


Recall that Avogadro’s Number gives us the number of entities present in 1 mole: 

There are 6.022 × 1023 Fe (II) ions in 1 mole Fe (II).


We will do a molecules → moles calculation based on Avogadro's number 


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Problem Details

How many Fe(II) ions are there in 20.00 g of FeSO 4?