\(\text{TH1: MNO3 → MNO2}\)
M + 62 → M + 46 (gam)
__9,4______ 4 (gam)
\(\rightarrow\text{4(M + 62) = 9,4.(M + 46) }\)
\(\rightarrow\text{ M = -34,14 (loại)}\)
\(\text{TH2: 2M(NO3)n → M2On}\)
2(M+62n) \(\rightarrow\) 2M+16n
___9,4________4
\(\rightarrow\text{8(M+62n) = 9,4.(2M+16n)}\)
\(\rightarrow\text{M = 32n}\)
Ta thấy: n = 2\(\Rightarrow\) M = 64 (Cu)
\(\rightarrow\)Muối đã dùng là Cu(NO3)2