: An environmental chemist analyzed the effluent (the released waste material) from an industrial process
known to produce the compounds carbon tetrachloride (CCla) and
benzoic acid (HC7H5O2), a weak acid that has one acidic hydrogen
atom per molecule. A sample of this effluent weighing 0.3518 g
was shaken with water, and the resulting aqueous solution
required 10.59 mL of 0.1546 M NaOH for neutralization. Calculate
the mass percent of HC7H5O2 in the original sample.
Ans: 56.82%

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 chemically inert, highly porous, amorphous form of sio2. because water vapor readily adsorbs onto the surface of silica gel, it acts as a desiccant. despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided you should be able to make an educated guess about the thermodynamic characteristics of the process. predict the signs for δg, δh, and δs for the adsorption of water.