The emperical formula will be FeSO4.
It is formula of the compound which shows the simplest ratio of elements in compound rather than the total number of atoms present in the molecule.
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We have given the percentage of the Oxygen = 42.13%, Iron =36.76% and Sulphur =21.11% .
let us canculate the no. Of moles of each element
Fe = 36.76/ 56
= 0.65 moles of fe
S = 21.11/ 32
= 0.65 moles of Sulphur
Oxygen = 46.13/16
= 2.88 moles of oxygen .
Now , we have to find the least no of moles and then divide that least number with every element moles .
0.65 is the least so , dividing it by Fe we get 1 , dividing itself get 1 and dividing it by oxygen we 4 .
We have to write the simplest number ,decimals doesn't matter .
now ,the formula we get is FeSO4.
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