Ishwar S. answered 04/01/19
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University Professor - General and Organic Chemistry
Chemical formula = FeSO4 • 7H2O
Molar mass of FeSO4 • 7H2O = 277.90 g/mol
Molar mass of 7H2O = 7 x 18.00 = 126.00 g/mol
%-H2O = (126.00 / 277.90) x 100% = 45.34%