Hòa tan hết 8,4 gam Fe trong dung dịch HCl 20% thu được FeCl2 và khí H2O (đktc)
a,Tính khối lượng dung dịch HCl 20% cần dùng
b,Tính khối lượng FeCl2 thu được
c,Nếu dùng dung dịch H2SO4 hòa tan lượng sắt nói trên thì thuu được bao nhiêu lít khí H2 (đktc)
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