A powder contains FeSO4.7H₂O (molar mass= 278.01 g/mol), among other components. A 3.870 g sample of the powder was dissolved in

Question

A powder contains FeSO4.7H₂O (molar mass= 278.01 g/mol), among other components. A 3.870 g sample of the powder was dissolved in HNO3 and heated to convert all iron to Fe³+. The addition of NH3 precipitated Fe₂O3.xH₂O, which was subsequently ignited to produce 0.554 g Fe₂O3.
What was the mass of FeSO4.7H₂O in the 3.870 g sample?
mass of FeSO4.7H₂O:

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