Câu 4: Chất phản ứng được với dung dịch NaOH dư đến cuối cùng thu được kết tủa là A. BaCl2. B. MgCl2. C. Na2SO4. D. Al2(SO4)3. Câu 5. Cho 20 gam hỗn hợp Mg và BaO tác dụng với dung dịch HCl thu được 3,808 lít khí H2(đktc). Vậy thành phần% khối lượng cuả BaO có trong hỗn hợp là A . 89,8. B. 20,4. C. 79,6. D. 36,2. giải giúp mình vs ạ

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