Which of the following pairings of pH and hydronium ion concentration is correct? A: pH = 7.0; [H3O+] = 1 x10^–7

B: pH = 2.0; [H3O+] = 1 x10^2

C: pH = 9.0; [H3O+] = 9 x10^–9

D: pH = 3.0; [H3O+] = 3 x10^–11

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

50 points! need answer asap. what type of organic compound contains the following functional group? (2 points)

Why do electrons further from the nucleus have more energy