Chemistry

Question Analysis
This question evaluates the student's ability to determine the molecular formula from the empirical formula and the molar mass of the compound.

Key Concept Explanation
The molecular formula is a multiple of the empirical formula, and this multiple (n) can be found by dividing the molar mass of the compound by the molar mass of the empirical formula.

Step-by-step Solution
1. Determine the molar mass of the empirical formula C₂H₃O: (2 × 12.01) + (3 × 1.008) + 16.00 = 43.044 g/mol.
2. Calculate n: n = 129 g/mol / 43.044 g/mol ≈ 3.
3. Multiply each subscript in the empirical formula by n: (C₂H₃O)₃ =