a/ Ta có: \(4M_{Zn}=5M_X\)
\(\Leftrightarrow M_X=\dfrac{4M_{Zn}}{5}=\dfrac{4.65}{5}=64\left(g/mol\right)\)
⇒ X là đồng (Cu)
b/
Ta có: \(M_O=\dfrac{1}{4}.M_X\)
\(\Leftrightarrow M_X=4M_{Zn}=4.16=64\left(g/mol\right)\)
⇒ X là đồng (Cu)
c/
Ta có: \(7M_X=10.M_{Fe}\)
\(\Leftrightarrow M_X=\dfrac{10.M_{Fe}}{7}=\dfrac{10.56}{7}=80\left(g/mol\right)\)
⇒ X là brôm (Br)