cho hỗn hợp X gồm Mg, Fe chia làm 2 phần bằng nhau P1 tác dụng vừa đủ với 200g dd HCl thu được 3,36l khí ở đktc p2 mang đốt cháy hoàn toàn thì thu được 14g chất rắn a) tính thành phần % của khối lượng mỗi chất trong hỗn hợp b) tính nồng độ % của dd HCl

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