Theo gt: \(M_{Ba\left(NO_3\right)_x}=261\)
\(\Leftrightarrow137+62x=261\)
\(\Rightarrow x=2\)
Vậy cthc: \(Ba\left(NO_3\right)_2\)
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Theo gt: \(M_{Fe_yO_3}=160\)
\(\Leftrightarrow56y+48=160\)
\(\Rightarrow y=2\)
Vậy cthc: \(Fe_2O_3\)
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\(M_{CuSO_a}=160\)
\(\Leftrightarrow96+16a=160\)
\(\Rightarrow a=4\)
Vậy cthc: \(CuSO_4\)
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Theo gt: \(M_{Ag_bNO_3}=170\)
\(\Leftrightarrow108b+62=170\)
\(\Leftrightarrow b=1\)
Vậy cthc: \(AgNO_3\)