## Chemistry: The Molecular Science (5th Edition)

Since $[X]$ is raised to the 2nd power, the reaction is second-order in X. $[Y]$ is raised to the $\frac{1}{2}$ power, so the reaction is 0.5-order in Y. $[Z]$ is raised to the first power, so the reaction is first-order in Z. Overall order= Sum of the orders for all substances=2+0.5+1=3.5