Pre-Equilibrium

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Write a rate law for the formation of NH3BH3 which involves only the concentration of reactants and rate constants.
B2H6+2NH32H3NBH3\underline{B_2H_6+2NH_3\to2H_3N-BH_3}
B2H6k1k12BH3k1k2B_2H_6 \xleftrightharpoons[k_{-1}]{k_1}2BH_3 \hspace{20pt} k_1 \gg k_2
2NH3+2BH3k22H3NBH3k1k22NH_3+2BH_3 \xrightarrow{k_2}2H_3N-BH_3 \hspace{20pt} k_{-1} \gg k_2