Q. How to find order of reaction? ( Class 12- chemical kinetics )

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The Order of reaction refers to the relationship between the rate of a chemical reaction and the concentration of the species taking part in it. In order to obtain the reaction order, the rate expression (or the rate equation) of the reaction in question must be obtained.

Once the rate equation is obtained, the entire composition of the mixture of all the species in the reaction can be understood.

Reaction Order

The order of reaction can be defined as the power dependence of rate on the concentration of all reactants. For example, the rate of a first-order reaction is dependent solely on the concentration of one species in the reaction. Some characteristics of the reaction order for a chemical reaction are listed below.

Reaction order represents the number of species whose concentration directly affects the rate of reaction.It can be obtained by adding all the exponents of the concentration terms in the rate expression.The order of reaction does not depend on the stoichiometric coefficients corresponding to each species in the balanced reaction.The reaction order of a chemical reaction is always defined with the help of reactant concentrations and not with product concentrations.The value of the order of reaction can be in the form of an integer or a fraction. It can even have a value of zero.

In order to determine the reaction order, the power-law form of the rate equation is generally used. The expression of this form of the rate law is given by r = k[A]x[B]y.

 

In the expression described above, ‘r’ refers to the rate of reaction, ‘k’ is the rate constant of the reaction, [A] and [B] are the concentrations of the reactants. The exponents of the reactant concentrations x and y are referred to as partial orders of the reaction. Therefore, the sum of all the partial orders of the reaction yields the overall order of the reaction.
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Now, find order of a reaction if for A --> B + C, it is found that the rate increases by a factor of 2.25 when it's concentration is increased by factor 1.5 at the same temp. Find order wrt A

aarongurung
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Sir ab krke to hum book se bhi padh lenge example de dijiye to hume samjh bbi a jaye..

singingterms
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Sir rate of reaction mei
A+B-. C
Hota he tab rate of reaction ko reactant ke term mei likhne ke liye dono reactant ko show karenge ya ek ko please tell me I am very confuse in this point🙏

musiclover
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Sir agar ye experimentally determined qty hqi toh firr hum isse aisw kyu add kr rhe hai idhar toh elementary rxn hqi yeh aisa krke
Likha bhi nhi hua hqi fir bhi kaiee add kr rhe

krishsoni
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Sir agr koi chemical reaction diya jaise k CH3CHO gives CH4 + CO
toh iska order and overall order kya hoga

abdullahsiddiqui
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Thnx sir for saving time in last minute

casualnoob
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Ch3cooc2h5 gives ch3cooh+c2h5oh in presence of hoh as catalyst find order of rxn

letsgrow
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Sir if the value of K for a rxn is 2.96×10^-30 sec^-1 . What is the order of rxn..?.

KuldeepSingh-etfu
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Thanks sir
Sir explain how to find rate determining step in a set of reactions

Arjun-svih
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Sir ch4 + co3
R= k{ch3cho}3/2
Order fo reaction 3/2
Sir ye power me 3/2 kease Aaya plz tell me

mr.shubhamsingh.
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H2+cl2 gives 2moles of hcl what is the order of rxn and please tell how to find it🙏🙏

letsgrow
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If rate is not given in reaction, then how to find order?? Plz reply sir🙏

mushu
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Thank you sir for awesome and wonderful explanation. 😊

nazmeenofficial
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Sir ek reaction h ise solve hi nhi krr pa rha hu m badi karri reaction hai
2NH{3} → N{2} + 3H{2} in the presence of Pt at 1130K




😊😊 Hope you reply soon😊😊

AryanGupta_
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Write the rate if reaction?
3A--->2B+C
Is question ko kaise kare sir ji

worldaqua
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Awesome, a nice explanation sir keep doing

grewalsatyawan