cho 13,7 gam hỗn hợp x gồm Mg và Zn tác dụng vào dung dịch HCl 20% dư sau phản ứng hoàn toàn thu được 8,96 lít khí hidro a) tính % theo khối lượng mỗi laọi trong hỗn hợp b) tính khối lượng dung dịch HCl đã dùng ( Biết dư 15% so với lượng phản ứng)

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