Ta có: %mO = 100 - (40 + 20) = 40%
CTTQ : CuxSyOz
\(\dfrac{64x}{40}\) = \(\dfrac{32y}{20}\) = \(\dfrac{16z}{40}\) = \(\dfrac{160}{100}\) = \(1,6\)
➢ \(\dfrac{64x}{40}\) = \(1,6\) ⇒ \(x\) = \(\dfrac{1,6.40}{64}\) = \(1\) (\(mol\))
➢ \(\dfrac{32y}{20}\) = \(1,6\) ⇒ \(y\) = \(\dfrac{1,6.20}{32}\) = \(1\) (\(mol\))
➢ \(\dfrac{16z}{40}\) = \(1,6\) ⇒ \(z\) = \(\dfrac{1,6.40}{16}\) = \(4\) (\(mol\))
Vậy CTHH là CuSO4
Chúc bạn học tốt !!!