How many moles of FeCl2 do you need to react 5 moles of Cl2?

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?

What must occur for air masses to form fronts

Can someone solve thierry two problems