How many grams of iron ammonium sulfate hexahydrate (Fe(NH4)2(SO4)2*6H20; 392.14 g/mol ) must be dissolved in a 250.0 mL volumetric flask to make a solution that has a Fe2 + concentration of 5.36x10 - 3 M? Be sure to enter you answer with the correct number of significant figures for the precision needed in the concentration.

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