Lars observes a substance to be a solid and to float in water at room temperature (23°c). based on the given properties, which substance is the most likely identity of this sample?

substance melting point (°c) boiling point (°c) density at room
temperature (g/cm3)
carbon tetrachloride -22.9 76.7 1.59
cetyl alcohol 49.3 344 0.811
dichlorobenzene 53.5 174 1.25
sulfur hexafluoride -64 -50.8 0.00617