What volume in millimeters of concentrated HCl(12) is needed to make 1500 mL of a 3.5 M solution

Drive down any three characteristic of modern periodic table

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?

40dm3 of gas at 760 torr are heated from 5°c to 50°c what is the new volume