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  4. At 300 K, half life of a gaseous reactant initially at 58 KPa is 320 min. When the pressure is 29 KPa, the half life is 160 mm. The order of the reaction is

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Q. At 300 K, half life of a gaseous reactant initially at 58 KPa is 320 min. When the pressure is 29 KPa, the half life is 160 mm. The order of the reaction is

NTA AbhyasNTA Abhyas 2020Chemical Kinetics

Solution:

$t_{1 / 2} \propto \frac{1}{a^{n - 1}}$

$\frac{t_{2}}{t_{1}}=\left(\frac{a_{1}}{a_{2}}\right)^{n - 1}$

$\frac{160}{320}=\left(\frac{58}{29}\right)^{n - 1}$

n = 0.