
Consider the reaction, . When concentration of B alone was doubled, the half-life of B did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit rate constant for this reaction is :
Answer
497.1k+ views
1 likes
Hint: The rate constant quantifies the rate and direction of chemical reaction. The general equation for finding rate constant of a reaction is
Where n = order of reaction
The order can be found from the reaction.
Complete Solution :
We have reaction -
- Further, we have been given that when A is doubled, the rate doubles. This means that rate is directly proportional to A.
Thus, the order of reaction with respect to A is 1.
When B is doubled, the half-life does not change.
- We know that in a first order reaction, half-life is independent of concentration.
The half-life can be given as -
=
- So, this means the reactant B follows first order rate.
Thus, the order of reaction with respect to B = 1
So, rate = [A] [B]
Thus, order of reaction = 2
So, the reaction is a Second order reaction.
The units of second order reaction are -
Note: The overall order of a reaction can be found from the sum of partial orders of the reactants. For example - In the above chemical reaction, the partial order of reactants A and B are 1. But the total order of reaction is 2. The order of reaction can be zero but it can not be negative.
Where n = order of reaction
The order can be found from the reaction.
Complete Solution :
We have reaction -
- Further, we have been given that when A is doubled, the rate doubles. This means that rate is directly proportional to A.
Thus, the order of reaction with respect to A is 1.
When B is doubled, the half-life does not change.
- We know that in a first order reaction, half-life is independent of concentration.
The half-life can be given as -
- So, this means the reactant B follows first order rate.
Thus, the order of reaction with respect to B = 1
So, rate = [A] [B]
Thus, order of reaction = 2
So, the reaction is a Second order reaction.
The units of second order reaction are -
Note: The overall order of a reaction can be found from the sum of partial orders of the reactants. For example - In the above chemical reaction, the partial order of reactants A and B are 1. But the total order of reaction is 2. The order of reaction can be zero but it can not be negative.
Recently Updated Pages
Master Class 11 Business Studies: Engaging Questions & Answers for Success

Master Class 11 Economics: Engaging Questions & Answers for Success

Master Class 11 Accountancy: Engaging Questions & Answers for Success

Master Class 11 Computer Science: Engaging Questions & Answers for Success

Master Class 11 English: Engaging Questions & Answers for Success

Master Class 11 Maths: Engaging Questions & Answers for Success

Trending doubts
Which one is a true fish A Jellyfish B Starfish C Dogfish class 11 biology CBSE

The flightless birds Rhea Kiwi and Emu respectively class 11 biology CBSE

Difference Between Prokaryotic Cells and Eukaryotic Cells

1 ton equals to A 100 kg B 1000 kg C 10 kg D 10000 class 11 physics CBSE

One Metric ton is equal to kg A 10000 B 1000 C 100 class 11 physics CBSE

How much is 23 kg in pounds class 11 chemistry CBSE
