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Problem 4. Suppose that the surface reaction A→B proceeds by the steps A+S⇄A-S A-S+xS→B-S+xS B-S⇄B+S in...

Problem 4. Suppose that the surface reaction A→B proceeds by the steps

A+S⇄A-S

A-S+xS→B-S+xS

B-S⇄B+S

in which x vacant sites are required for the reaction step to occur. What is a reasonable rate expression r”(PA, PB), with this mechanism?

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