hòa tan hoàn toàn 5,6gam Fe bằng một lượng vừa đủ dung dịch HCl 0,1M .Sau phản ứng thu được dung dịch X và thoát ra V lít khí H2 (đktc) a)tính giá trị của V b)tính thể tích dung dịch HCl cần dùng các bạn giúp mình vs

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