The empirical formula of a compound of molecular mass  240u  is  CH2O . The molecular formula of the compound is:

To determine the molecular formula of the compound, we need to compare the empirical formula (CH2O) with the molecular mass (240u).

Step 1: Calculate the empirical formula mass: The empirical formula mass can be calculated by adding the atomic masses of the elements in the empirical formula. Empirical formula mass = (1 * atomic mass of C) + (2 * atomic mass of H) + (1 * atomic mass of O)

Step 2: Calculate the empirical formula mass: The atomic mass of carbon (C) is approximately 12u, the atomic mass of hydrogen (H) is approximately 1u, and the atomic mass of oxygen (O) is approximately 16u. Empirical formula mass = (1 * 12u) + (2 * 1u) + (1 * 16u) Empirical formula mass = 12u + 2u + 16u Empirical formula mass = 30u

Step 3: Determine the molecular formula: To find the molecular formula, we need to divide the molecular mass by the empirical formula mass. Molecular formula = Molecular mass / Empirical formula mass Molecular formula = 240u / 30u Molecular formula = 8

Therefore, the molecular formula of the compound is 8 times the empirical formula, which gives us C8H16O8.