Alkenes have a relative density for hydrogen of 56. Determine the number of carbon
| April 4, 2021 | education
Alkenes have a relative density for hydrogen of 56. Determine the number of carbon atoms that are contained in one molecule of this hydrocarbon.
Alkenes have the general formula: CnH2n.
1. Let’s calculate the molecular weight of the alkene by the formula (D (H2) – relative density by hydrogen):
M (CnH2n) = D (H2) * M (H2) = 56 * 2 = 112
2. Determine the alkene formula:
M (СnH2n) = 12 * n + 2 * n = 14n
14n = 112
n = 8
The alkene formula is C8H16. It’s octen.
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