Объёмные доли смеси: φ(He) = 20 %, φ(CH₄) = 80 %. Вычислите среднюю молярную массу (г/моль).

  1. 13,6
  2. 9,6
  3. 6,4
  4. 4,8

📝 Detailed explanation

M̄ = 0,2·4 + 0,8·16 = 0,8 + 12,8 = 13,6 г/моль.
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