One mole of 50Sn atoms has a mass of:​

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 is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0

All forces cause motion? true or false