Determine the molecular weight of an aldehyde whose vapor density relative to hydrogen is 29.

univerkov | September 16, 2021 | education

Answer: Mr (ald.) = 58.
Explanation of the solution to the problem: to solve this problem, it is necessary to use the following formula: D (ald. / H2) = Мr (ald.) / Мr (Н2), where D (ald. / H2) is the relative density of aldehyde with respect to hydrogen, Мr (ald.) – molecular weight of aldehyde, Мr (Н2) – molecular weight of hydrogen.
Substituting the values known from the problem statement into the formula, we get: Мr (ald.) = D (ald. / H2) * Мr (Н2) = 29 * 2 = 58.
This molecular weight corresponds to acetaldehyde.

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