Question:
The following graph shows how $(t_{1/2})$ a (half life) of a reactant R changes with the initial reactant concentration $a_0$. The order of the reaction will be
The following graph shows how $(t_{1/2})$ a (half life) of a reactant R changes with the initial reactant concentration $a_0$. The order of the reaction will be
Updated On: Jan 18, 2023
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The Correct Option is C
Solution and Explanation
For second order reaction,
It can be represented as : $-\frac{dx}{dt}=Kx^{2}$
$\frac{1}{\left[a\right]}=\frac{1}{\left[a_{0}'\right]}+Kt; Kt_{1/2}=\frac{1}{\left[a_{0}'\right]}$
half-life $\left(t_{1/2}\right)=\frac{1}{K\left[a_{0}'\right]}$
So, graph of $t_{1/2}$ and $\frac{1}{a_{0}}$, is linear.
It can be represented as : $-\frac{dx}{dt}=Kx^{2}$
$\frac{1}{\left[a\right]}=\frac{1}{\left[a_{0}'\right]}+Kt; Kt_{1/2}=\frac{1}{\left[a_{0}'\right]}$
half-life $\left(t_{1/2}\right)=\frac{1}{K\left[a_{0}'\right]}$
So, graph of $t_{1/2}$ and $\frac{1}{a_{0}}$, is linear.
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Concepts Used:
Order of Reaction
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 equation of the reaction will given in the question.
Characteristics of the reaction order
- 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.
- Integer or a fraction form the value of the order of reaction will be there and it can be zero.