Question

If 0.525 g of Fe2O3 and xH2O are heated and 0.400 g of Fe2O3 are obtained, what is the value of x?

Answer 1

Fe2O3 + H2O = 0.525 g
Fe2O3 = 0.400
H2O must be 0.525-0.400 = 0.125 g