\(\%O=100\%-\left(20+26,667\right)=53,333\%\)
Gọi CT: MgxSyOz
x:y:z = \(\dfrac{20}{24}:\dfrac{26,667}{32}:\dfrac{53,333}{16}\)
= 0,8 : 0,8 : 3,33
= 1 : 1 : 4
=> \(MgSO_4\)
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