设原混合物中含有xmolFe,ymolFe 2O 3,
Fe 2O 3+6HCl=2FeCl 3+3H 2O
y2y
2FeCl 3+Fe=3FeCl 2
2y y 3y
Fe+2HCl=FeCl 2+H 2↑
(x-y)(x-y) (x-y)
则:[3y+(x-y)]:(x-y)=7:1,
y:x=3:2,
故选D.
设原混合物中含有xmolFe,ymolFe 2O 3,
Fe 2O 3+6HCl=2FeCl 3+3H 2O
y2y
2FeCl 3+Fe=3FeCl 2
2y y 3y
Fe+2HCl=FeCl 2+H 2↑
(x-y)(x-y) (x-y)
则:[3y+(x-y)]:(x-y)=7:1,
y:x=3:2,
故选D.