Advertisements
Advertisements
Question
Define order of reaction. How does order of a reaction differ from molecularity for a complex reaction?
Advertisements
Solution
Order of Reaction :
Rate = K[A]x [B]y
(x + y) = order of that chemical reaction.
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 Reaction | Molecularity |
| Sum of power of the concentration of the reactants in the rate law expression | The number of reacting species (atoms, ions or molecules) taking part in an elementing reaction, which must colloide simultaneously in order to being about a chemical reaction. |
| Order is an experimental quantity It can be 0 or fraction. |
It cannot be zero or a non- integer |
| Order is applicable to elementary as well as complex reaction |
For complex reaction, molecularity has no meaning. |
APPEARS IN
RELATED QUESTIONS
The rate constant for a first order reaction is 60 s−1. How much time will it take to reduce the initial concentration of the reactant to its `1/16`th value?
The rate constant of a first order reaction is 6.9 × 10–3s–1. How much time will it take to reduce the initial concentration to its 1/8th value?
The reaction X → product
Follow first order of kinetics. In 40 minutes the concentration of 'X' changes from 0.1 m to 0.025. M. The rate of reaction when concentration of X is 0.01 m is.
The slope in the plot of `log ["R"]_0/(["R"])` Vs. time for a first-order reaction is ______.
Radioactive decay follows first-order kinetics. The initial amount of two radioactive elements X and Y is 1 gm each. What will be the ratio of X and Y after two days if their half-lives are 12 hours and 16 hours respectively?
The following data were obtained during the decomposition of SO2Cl2 at the constant volume. SO2Cl2 →SO2(g) + Cl2(g)
| Time (s) | Total Pressure (bar) |
| 0 | 0.5 |
| 100 | 0.6 |
Calculate the rate constant of the reaction.
Write the equation for integrated rate law for a first order reaction.
Show that `t_(1/2)= 0.693/k` for first reaction.
Write the unit of rate constant [k] for the first order reaction.
If the half-life (t1/2) for a first order reaction is 1 minute, then the time required for 99.9% completion of the reaction is closest to ______.
