Help me. please?

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 best discribes the relationship between wavelength and frequency in a electromagnetic wave

How many moles of oxygen gas are produced from the decomposition of six moles of potassium chlorate