Thus, as the solution is % by mass, one assumes that the mass of urea is 26g and the mass of the solution 100g, in such a way, one computes the moles of urea by knowing its molecular mass:
Now, as solution has a mass of 100g, the solvent has a mass of 74g which corresponds to 0.074L since the density of water is 1g/mL; in such a way the molality is:
The correct answer from the choices given is the third option. Covalent compounds have low boiling points. Also, their melting points are low. Covalent bonds have relatively low attractions which results to these properties. The bonds are easily broken by taking energy or adding energy.