Problem

Consider the gas-phase reaction: H2( g) + I2( g)¡2 HI( g) The reaction was experimentally determined to be first order in H2 and first order in I2. Consider the proposed mechanisms. Proposed mechanism I: H2( g) + I2( g)¡2 HI( g) Single step Proposed mechanism II: I2(g) Δk1k-12 I(g) Fast H2( g) + 2 I( g) ¡k22 HI( g) Slow b. What kind of experimental evidence might lead you to favor mechanism II over mechanism I?

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