Ответ:n(He) = (0.2 * 0.5) / (0.0821 * 273) * (1 / 4) * 6.02 * 10^23 = 3.7 * 10^20
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Ответ:n(He) = (0.2 * 0.5) / (0.0821 * 273) * (1 / 4) * 6.02 * 10^23 = 3.7 * 10^20