Case: Read the passage and answer the following questions

In the rate equation Rate = k [A]^x[B]^y

 x and y indicate how sensitive the rate is to the change in concentration of A and B. Sum of these exponents, i.e., x + y gives the overall order of a reaction whereas x and y represent the order with respect to the reactants A and B respectively. Hence, the sum of powers of the concentration of the reactants in the rate law expression is called the order of that chemical reaction. Order of a reaction can be 0, 1, 2, 3 and even a fraction.

What is the unit of rate constant for a first order reaction?

s^-1

For a first order reaction,

rate constant k = (concentration/time)x(1/concentration)m

                      = (molL^-1/s)x(1/molL^-1)

                      =s^-1