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nguyenhueqx4
2 năm trước
nhúng lá kẽm nặng 13g vào 200 ml dd Cuso4. sau pư hoàn toàn lấy kẽm ra rửa nhẹ làm khô cân lại đc 12.75g a, tính m lá kẽm pư b, tính CM cuso4
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