В 0,025 моль кристаллогидрата Na₂CO₃·nH₂O содержится 19,8·10²³ протонов. Определите n. (Nₐ=6·10²³)

  1. 5
  2. 7
  3. 6
  4. 8

📝 Detailed explanation

Протонов в формуле: 2·11+6+3·8+n(2+8)=52+10n. 0,025·(52+10n)=19,8·10²³/6·10²³=3,3. 52+10n=132 → n=8.
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