A reaction X2 + XY + Z2 ? X3Z + YZ (where X,Y,Z are atoms) is shown to have the following rate behavior:
Rate (M/s) [X2] (M) [XY] (M) [Z2] (M)
0.00027 0.1 1.0 0.3
0.00027 0.1 2.0 0.3
0.00054 0.2 1.0 0.3
0.00108 0.2 1.0 0.6
Propose a mechanism for the reaction.