Which is not a Vesper electron domain

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

What type of reaction fuels the processes seen here?

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