Determine the molecular formula of a cycloalkane if its vapor density with respect to nitrogen is 2.5.
| February 7, 2021 | education
Let the molecular formula of the unknown cycloalkane be: CnH2n.
Let’s determine the molecular weight of CnH2n:
M (CnH2n) = M (N2) * DN2 (CnH2n) = 28 * 2.5 = 70 (amu).
Let’s compose and solve the equation:
12 * n + 1 * 2n = 70,
14n = 70,
n = 5, whence the formula of cycloalkane: C5H10 (which corresponds to cyclopentane).
Answer: C5H10.
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