M(C2H2) = 12*2+2 = 26 г/моль
M(He) = 4 г/моль
D = 26/4 = 6.5
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M(C2H2) = 12*2+2 = 26 г/моль
M(He) = 4 г/моль
D = 26/4 = 6.5