It is believed that N2 and H2 are chemisorbed on Fe as N and H atoms, which then react stepwise to give NH3. What would be the stoichiometric number of the rate-determining step in the Fe-catalyzed synthesis of NH3 if the rate-determining step were: (a) N2 + 2* → 2N*; (b) H2 + 2* → 2H*; (c) N* + H* → *NH + *; (d) *NH + H* → *NH2 + *; (e) *NH2 + H* → *NH3 + *; (f) *NH3 → NH3 + *? Rate measurements using isotopic tracers indicate that the stoichiometric number of the rate-determining step is probably 1 for the NH3 synthesis on iron. What does this indicate about the rate-determining step? Write the overall reaction with the smallest possible integers.
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