What are the units of k in the following rate law? Rate = k[X][Y]^1/2

Question

Quizplus · Accepted Answer

From the given rate law, we can see that the overall order of the reaction is (1 + 1 + 1/2) = 2.5. Therefore, the units of the rate constant (k) will be (M^(1.5-s)) (mol^(1-u)) (s^(-1)) where s, u are the stoichiometric coefficients of X and Y, respectively. 
Based on this, option D is the best choice as it matches the required units of k. Option A, B, C, and E do not match the required units of k.

What Are the Units of K in the Following Rate