Here's how to determine the molecular formula of a compound given its empirical formula and molar mass:

1. Calculate the empirical formula mass:

* The empirical formula C₂H₅ has a mass of: (2 * 12.01 g/mol C) + (5 * 1.01 g/mol H) = 29.07 g/mol

2. Determine the ratio of the molar mass to the empirical formula mass:

* Molar mass / Empirical formula mass = 58 g/mol / 29.07 g/mol ≈ 2

3. Multiply the subscripts in the empirical formula by the ratio:

* Since the ratio is 2, multiply the subscripts in C₂H₅ by 2: C₂H₅ * 2 = C₄H₁₀

Therefore, the molecular formula of the compound is C₄H₁₀.