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maichi201004
2 năm trước
cho 7,8 gam hỗn hợp gồm nhôm và kl X hoá trị ( II ) tác dụng vừa đủ với axit sunfuric 25% . sau phản ứng thu dc dd D trong đó nồng độ dd của muối của kl Xtrong D là 7,674% và có 8,69 lít khí thoát ra đktc a. tính KL dd D b. xác định KL biết hỗn hợp trong KL X chiếm khoảng 30,7692%
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