Final answer:
None of the compounds listed by the student (Hg, H2O, NH3, CH4) is presented with an equation showing its sublimation. Sublimation is the direct phase change from solid to gas, and dry ice (CO₂) undergoing sublimation is an example.
Step-by-step explanation:
The sublimation is the phase change from a solid directly to a gas, skipping the liquid phase. The substances that can undergo sublimation include dry ice (solid CO₂), iodine, naphthalene, and 1,4-dichlorobenzene. Among the options given by the student, none directly represent the process of sublimation.
However, the enthalpy of sublimation (AHsub) is an important concept in understanding this process. For instance, the sublimation of dry ice, CO₂ (solid), at standard temperature and pressure is represented by the enthalpy of sublimation being 26.1 kJ/mol.