J.R. S. answered 02/12/20
Tutor
5.0
(145)
Ph.D. University Professor with 10+ years Tutoring Experience
iron (ii) sulfate heptahydrate = FeSO4•7H2O
Molar mass = 278 g/moll
Molar mass H2O = 18 g/mol
7 mol H2O = 7 x 18 = 126 g
% water = 126 g/278 g (x100%) = 45.3%