Millikan measured the quantity of charge carried
by an electron. how did he then calculate the
mass of an electron?

What is impossible to do with a hypothesis

Ineed ! i have no clue how to do this problem.

Consider the following multistep reaction: a b→ab(slow) a ab→a2b(fast)−−−−−−−−−−−−−−−−− 2a b→a2b(overall) based on this mechanism, determine the rate law for the overall reaction. express your answer in standard masteringchemistry format. for example, if the rate law is k[a]3[b]2 type k*[a]^3*[b]^2