how do u calculate the percentage of water of cystallisation in FeSO4.7H2O

percent water= 7*molmassH20/molmassFeSO4.7H2O * 100

now to get the mole mass of FeSO4.7H2O * 100, it is the sum of the atomic mass of one Fe, one S, four O, 14H, and 7 O.

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