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kht
2 năm trước
cho 19,3g hh bột ( zn, cu) có tỉ lệ số mol tương ứng là 1:2 vào dd chứa 0,2 mol Fe2(SO4)3 , sau khi các pư xảy ra hoàn toàn thu đc a g kim loại , tính a
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