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Cho một lượng mạt sắt dư vào 50ml dung dịch HCl thu được 4,994 l khí ( đkc) a) Viết phương trình hóa học. b) Tính khối lượng mạt sắt đã phản ứng . c) Tính nồng độ mol của dung dịch HCl đã dùng
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