Question

The rate constant (K) for the reaction 2A + B → product, was found to be 2.5 × 10–5litre mol–l sec–1 after 15 sec, 2.60 × 10–5lit mol–l sec–1 after 30 sec and 2.55 × 10–5lit mol–l sec–1 after 50 sec. The order of reaction is​

Answer 1

Unit of rate constant K is (mole/litre)^(1-n) • sec -1

According to this, unit given in question is for n=2

So here order of reaction will be 2

Answer 2

Answer:

The order of reaction is​ 2 that is second order kinetics.

Explanation:

2A + B → product

The rate constant of the reaction after 15 seconds:

$2.5\times 10^{-5} L mol^{-1} s^{-1}$

Units of rate constant can be used to predict the order of the reaction:

• Units of rate constant for zero order reaction is $mol L^{-1} s^{-1}$
• Units of rate constant for first order reaction is $sec^{-1}$
• Units of rate constant for second order reaction is $L mol^{-1} s^{-1}$

Units of rate constant given in the question: $L mol^{-1} s^{-1}$

The units of rate constant are same as that of the second order reaction's rate constant.Hence, the given reaction is of second order kinetic.