How much PEG(M.W. 3350)/magnetite (Fe3O4) powder should be added to water to obtain aq. solution with iron concentration of [Fe]=1 mM?

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Bibek Thapa

Dear El-Naggar, thank you so much for the answer. But I do not have idea to calculate the concentration of iron (Fe) only. While it is coated with polymer as well. Do you think the webpage provided you is suitable to calculate the concentration of single element of the compound? I mean the concentration of Fe3O4 is same as that of Fe only?