The formula and formula mass of heptahydrate ferrous sulfate respectively are ______

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Solution

The formula of heptahydrate ferrous sulfate is
Hepta means 7 and hydrate means Water(H₂O).
Formula of Ferrous sulfate is FeSO₄
So, The overall formula of heptahydrate ferrous sulfate is FeSO₄.7H₂O.
The formula mass of heptahydrate ferrous sulfate is
The molecular mass of Iron(Fe)+ molecular mass of Sulphur(S)+4 X molecular mass of Oxygen(O) + 14X molecular mass of Hydrogen(H) + 7 X molecular mass of Oxygen(O)
= 55.9 + 32 +4 X 16 + 14 X 1 + 7 X 16
= 277.9 g mol^-1
= 278 g mol^-1
So, The formula and formula mass of heptahydrate ferrous sulfate respectively are FeSO₄.7H₂O, 278g mol^-1

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