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Solution

From the given data in the table

from first two data points

CH3Cl is doubled, Cl2 is kept constant, rate also doubled

so order with respect to CH3 l = 1

from second and third data points

Cl2 is doubled, CH3Cl is kept constant, rate increased by 1.5 times

order with respect to Cl2 = 0.5

Part A)

So expression for reaction rate law becomes,

Rate = k[CH3Cl[Cl2]^1/2