To determine the molecular formula, we need to know the molar mass of the compound. The empirical formula CH suggests that the compound is composed of carbon and hydrogen atoms in a 1:1 ratio. The molar mass of CH is 13 g/mol (12 g/mol for carbon + 1 g/mol for hydrogen). Since the actual mass of the compound is 26 grams, the molecular formula must be a multiple of the empirical formula.

To find the multiple, we divide the actual mass by the molar mass of the empirical formula:

$$\frac{Actual \space Mass}{Molar \space Mass \space of \space Empirical \space Formula}=\frac{26g}{13 g/mol}=2$$

This means that the molecular formula must be a dimer of the empirical formula, with twice the number of atoms. Therefore, the molecular formula is C2H2.