14. A weighing of 0.5000 g of FeSO4•7H2O (mol. mass 278.05) was dissolved in 100.0 ml of 1M HCl. The potential of a platinum electrode immersed in this solution is 0.320 V relative to the NKE. Calculate the mass fraction (%) of Fe2(SO4)3 in the preparation. Mol. mass (Fe2(SO4)3) 399.88; E0Fe 3+ /Fe 2+, 1M HCl = 0.459V.

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