Cho 30,6 gam hỗn hợp Cu, Fe, Zn tác dụng với dung dịch HNO3 loãng dư thu được
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Cho 30,6 gam hỗn hợp Cu, Fe, Zn tác dụng với dung dịch HNO3 loãng dư thu được dung dịch chứa 92,6 gam muối khan ( không chứa muối amoni ). Nung hỗn hợp muối đến khối lượng không đổi, thu được m gam
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