Масса 150 молекул гидроксохлорида трёхвалентного металла равна 3,5·10⁻²⁰ г. Определите металл. (Nₐ=6·10²³)

  1. Fe
  2. Mn
  3. Cr
  4. Al

📝 Detailed explanation

M = (3,5·10⁻²⁰/150)·6·10²³ = 140 г/моль. Состав M(OH)Cl₂ для III-валентного: M+17+71=140 → M=52 → Cr.
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