If you stacked avogadro's number of pennies one on top of the other on earth's surface, how far would the stack extend (in kilometers)?

Calculate the number of molecules present in 0.750 mol of mgo.

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?

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.