The rate controlling step for the heterogeneous irreversible catalytic reaction A(g) + B(g) ? C(g) is the surface reaction of absorbed A with absorbed B to give adsorbed C. The rate expression for this reaction can then be written as (where, KA, KB and KC are the equilibrium constants and is the rate constant of the rate controlling step) ?

A. k KAKB pApB / (1 + KApA + KBpB + KCpC)

B. k KAKB pApB / (1 + KApA + KBpB)

C. k KA pApB / (1 + KApA + KBpB)

D. k KAKB pApB / (1 + KApA + KBpB + KCpC)2
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