An electrically neutral atom of gallium has 31 electrons and 39 neutrons. what is the mass number for an atom of gallium

Find the number of moles of argon in 364g of argon.

What can be done to make a solid solute dissolve faster in a liquid solvent?

Which statement is actually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.