Hòa tan hoàn toàn 10,2g một oxit kim loại cần 331,8g dung dịch H2SO4 vừa đủ. Dung dịch muối sau phản ứng có nồng độ 10%. Xác định CTHH của oxit kim loại. Cho 2,016 g kim loại M có hoá trị không đổi tác dụng hết với oxi, thu được 2,784 g chất rắn. Hãy xác định kim loại đó.

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