0,2 моль XH₃ имеют массу 3,4 г. В ядре X 7 нейтронов. Найдите число электронов в ионе X³⁻.

  1. 14
  2. 9
  3. 12
  4. 10

📝 Detailed explanation

M(XH₃) = 3,4/0,2 = 17 г/моль → X = 14 (N). N³⁻: 7 + 3 = 10 ē.
56 / 71 (79%)
Question 56 of 71
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