Природный хром состоит из изотопов: ⁵⁰Cr — 4,35%; ⁵²Cr — 83,79%; ⁵³Cr — 9,5%; ⁵⁴Cr — 2,36%. Найдите среднюю атомную массу.

  1. 52,15
  2. 52,2
  3. 51,9
  4. 52,05

📝 Detailed explanation

Ā = 50·0,0435 + 52·0,8379 + 53·0,095 + 54·0,0236 ≈ 2,175 + 43,571 + 5,035 + 1,274 ≈ 52,05.
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