For the elementary reaction M→N the rate or disappearance of M increases by a factor of 8 upon doubling the concentration of M. The order of the reaction with respect to M ts

For elementary reaction, M→NRate law can be written as rate ∝MnRate =kMn                                  ……(i)When we double the concentration of [M], rate becomes 8 times, hence, new rate law can be written as                           8× rate =k[2M]n⇒ Rate 8× rate =k[M]nk[2M]n∴ 18=1[2]n ⇒ 2n=8=23⇒n=3