D air. (substances) = 1.862
1) Alkadienes have the general formula:
2) Calculate the molar mass of the substance:
M (СnH2n-2) = D air. (СnH2n-2) * M (air) = 1.862 * 29 = 54 g / mol;
3) Determine the relative molecular weight of the substance:
M (CnH2n-2) = Mr (CnH2n-2) = 54;
4) Determine the molecular formula of the substance:
Mr (CnH2n-2) = Ar (C) * N (C) + Ar (H) * N (H);
54 = 12 * n + 1 * (2n-2);
n = 4;
Unknown substance – C4H6.
Answer: Unknown substance – C4H6.
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