Какие газы при нормальных условиях имеют одинаковые плотности? Ar(H)=1, Ar(C)=12, Ar(O)=16, Ar(N)=14
I. CO
II. C2H6
III. NO
IV. CO2
A) II, IV
B) I, II
C) II, III
D) I, IV
E) I, III
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