Смесь гелия и неона в 4,8 раза легче озона. Вычислите массовую долю гелия в смеси.

  1. 1/3
  2. 1/4
  3. 2/3
  4. 1/2

📝 Detailed explanation

M̄ = 48/4,8 = 10. Пусть x — мольная доля He: 4x + 20(1−x) = 10 → x=0,625. ω(He) = 0,625·4/10 = 0,25 = 1/4.
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