Ответы на вопрос:
M(c2h4) = 8.8 g m(c2h4) = 28 g/mol n(c2h4) = 8.8/28 = 0.3 mol n(c2h4) = v/vm; 0.3 = v/22.4; v = 0.3*22.4 = 6.72 л
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