PLS HELP THESE ARE RHE ONLY QUESTIONS I HAVE LEFT DUE SOON

Based on the equation and the information in the table, what is the enthalpy of the reaction?

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?

In 2002, the rare earth elements mine in mountain pass, california was closed because