Consider the reaction 2xy2+z2⇌2xy2z which has a rate law of rate = k[xy2][z2] select a possible mechanism for the reaction.

Answer is:

Step 1: XY₂ + Z₂ → XY₂Z + Z (slow).

Step 2: XY₂ + Z → XY₂Z (fast).

Overall reaction: step 1 + step 2:

XY₂ + Z₂ + XY₂ + Z ⇌ XY₂Z + Z + XY₂Z.

2XY ₂+Z₂ ⇌ 2XY₂Z.

The sum of the two elementary steps is equivalent to the stoichiometric equation. Rate of chemical reaction depends on slow step (step 1).