The relative hydrogen density of the ester vapor is 30. Determine the structural formula of this ester.

1. We write down data on the condition of the problem:
Given: R1 – COO – R2 – ester;
D (H2) = 30;
M (H2) = 2 g / mol;
Define: formula.
2. Find the molar mass:
M (ether) = D (H2) * M (H2) = 30 * 2 = 60 g / mol.
4. Establish the formula for organic matter:
CnH2nO2 – general formula;
CnH2nO2 = 60;
12n + 2 + 32 = 60;
12n = 60-34;
12n = 26;
n = 2.16;
C2H4O2;
M (C2H4O2) = 2 * 12 + 4 + 32 = 60;
Structural formula: H – COO – CH3.
Answer: C2H4O2 – formic acid methyl ester.