What do elements in the same column in the periodic table have in common?

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

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.