The small bags of silica gel you often see in a new shoe box are placed there to control humidity. Despite its name, silica gel is a solid. It is a chemicallyinert, highly porous, amorphous form of SiO2. Water vapor readily adsorbs onto the surface of silica gel, so it acts as a desiccant. Despite not knowingmechanistic details of the adsorption of water onto silica gel, from the information provided, you should be able to make an educated guess about the thermodynamiccharacteristics of the process. Predict the signs of ?G, ?H, and ?S.
They are all less than 0. So, delta G<0, delta H <0, and delta S<0.