URGENT: 5 milliscruples is how many pounds?

20 grains=1 scruple
3 scruples=1 dram
8 drams= 1 ounce
16 ounces= 1 pound

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