The small bags of silica gel you often see in a new shoe box are placed there to
ID: 1005530 • Letter: T
Question
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 solid. It is chemically inert, highly porous, amorphous form of SiO2. Water vaper readily absorbs onto the surface of silica gel, so 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 ale to make an educated guess about the thermodynamic characteristics process. Predict the signs of the change in G, change in H and change in S.
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. Water vapor readily adsorbs onto the surface of silica gel, so 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 of G,AH, and S.Explanation / Answer
For this process Kelvin temperature is positive.
Silica and water reaction is an example of adsorption process, which is exothermic process, dH < 0 negative process
By adsorption process entropy will decreases therefore dS < 0
dG = dH – TdS
= - ve – T (- ve)
= - ve
Because dH> TdS
G<0, spontanteous
H<0, from equation
S<0
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