FeO +H2SO4 --> FeSO4 +H2O(*)
nFeO=0,05(mol)
theo (*) : nH2SO4=nFeSO4 =nFeO=0,05(mol)
=>mddH2SO4\(\dfrac{0,05.98.100}{12,25}=40\left(g\right)\)
=>mddcòn lại=40-5,56=34,44(g)
mFeSO4=7,6(g)
=>a=\(\dfrac{7,6}{34,44}.100=22,07\left(g\right)\)
=> SddFeSO4.7H2O=\(\dfrac{100.22,07}{100-22,07}=28,3\left(g\right)\)