The relative vapor density of the monobasic saturated carboxylic acid for hydrogen is 37.

The relative vapor density of the monobasic saturated carboxylic acid for hydrogen is 37. Determine the molecular formula of the acid, name it.

Let’s execute the solution by writing down the data on the condition of the problem:
1. Given: R – COOH – monobasic carboxylic acid;
D (H2) = 37;
M (H2) = 2 g / mol;
Determine: molecular formula.
2. Calculation of molar mass:
M (RCOOH) = D (H2) * M (H2) = 37 * 2 = 74 g / mol.
3. Establish the acid formula:
CnH2n + 1COOH = 74;
12n + 2 + 1 + 12 + 32 + 1 = 74;
12n = 74 – 48;
12n = 26;
n = 2.2;
Based on these data, the acid radical is a carbon atom.
Formula: C2H5 – COOH;
Checking: M (C3H6O2) = 12 * 3 + 6 + 32 = 74 g / mol.
Answer: C3H6O2 – propionic acid.