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?
Answer & explanation
Correct answer: option 4
For a first order reaction,
rate constant k = (concentration/time)x(1/concentration)m
= (molL-1/s)x(1/molL-1)
=s-1