Chemical Kinetics - Result Question 48
####49. The activation energy of a reaction can be determined from the slope of which of the following graphs?
[2015]
(a) $\frac{\ln K}{T}$ vs. $T$
(b) $\ln K$ vs. $\frac{l}{T}$
(c) $\frac{T}{\ln K} vs \cdot \frac{l}{T}$
(d) $\ln K$ vs. $T$
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Solution:
- (b) Arrhenius equation
$K=A \cdot e^{-E_a / R T} \Rightarrow \ln K=\ln A-\frac{E_a}{R T}$
slope $=\frac{-E_a}{R}$
so, activation energy of reaction can be determined from the slope of $\ln K vs \frac{1}{T}$
Arrhenius Equation
$K=A e^{-E a / R T}$, where $e^{-E a / R T}$ represents the fraction of molecules
