What is the pH at the equivalence point in the titration of a 18.4 mL sample of a 0.303 M aqueous hydrocyanic acid solution with a 0.397 M aqueous sodium hydroxide solution

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?

Given the following reaction: c3h8+5o2=3co2+4h20 how many grams of co2 will be produced 7 g of c3h8 and 98 g of o2

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5