(Answered) A what is the percent by mass of water in ironii sulfate

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a. What is the percent by mass of water in iron(II) sulfate heptahydrate, FeSO4•7H2O (or what percent of the molar mass of FeSO4•7H2O is due to the waters of crystallization)?

b. What mass due to waters of crystallization is present in a 3.38-g sample of FeSO4•7H2O?

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