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Aquangcuong347 giúp e với ạ Hòa tan 12,4 gam hỗn hợp gồm Fe3O4 , MgO, ZnO trong V (ml) dung dịch H2SO4 0,2 M vừa đủ thu được dung dịch X. Sau phản ứng hoàn toàn cô cạn dung dịch X thu được 25,2 gam muối khan. a/ Viết PTHH b/ Tính a
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