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An observation that requires measurement is called quantitative observable or qualitative

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?

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %