Q. 20

For the decomposition of azoisopropane to hexane and nitrogen at 543 K, the following data are obtained.


Calculate the rate constant.

Answer :

When t = 0, the total partial pressure is P0 = 35.0 mm of Hg



When time t = t, the total partial pressure is Pt = P0 + p


P0-p = Pt-2p, but by the above equation, we know p = Pt-P0


Hence, P0-p = Pt-2( Pt-P0)


Thus, P0-p = 2P0 – Pt


We know that time


Where, k- rate constant


[R]° -Initial concentration of reactant


[R]-Concentration of reactant at time ‘t’


Here concentration can be replaced by the corresponding partial pressures.


Hence, the equation becomes,


equation 1


At time t = 360 s, Pt = 54 mm of Hg and P0 = 30 mm of Hg,


Substituting in equation 1,



k = 2.175 × 10-3 s-1


At time t = 720 s, Pt = 63 mm of Hg and P0 = 30 mm of Hg,


Substituting in equation 1,



Thus, k = 2.235 × 10-3 s–1


Taking average, k = (2.235 × 10-3 s–1 + 2.175 × 10-3 s–1)/2


k = 2.21 × 10-3 s–1.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Interactive Quiz on Integrated Rate equationInteractive Quiz on Integrated Rate equationInteractive Quiz on Integrated Rate equation58 mins
Interactive quiz on arrhenius equationInteractive quiz on arrhenius equationInteractive quiz on arrhenius equation53 mins
Arrhenius equation & Collision TheoryArrhenius equation & Collision TheoryArrhenius equation & Collision Theory59 mins
Integrated Rate EquationIntegrated Rate EquationIntegrated Rate Equation52 mins
Questions based on Chemical ReactionQuestions based on Chemical ReactionQuestions based on Chemical Reaction57 mins
Factors influencing Rate of Chemical ReactionFactors influencing Rate of Chemical ReactionFactors influencing Rate of Chemical Reaction45 mins
Questions Based on Factors influencing Rate of Chemical ReactionQuestions Based on Factors influencing Rate of Chemical ReactionQuestions Based on Factors influencing Rate of Chemical Reaction41 mins
Learn Rate of a Chemical ReactionLearn Rate of a Chemical ReactionLearn Rate of a Chemical Reaction65 mins
15 Concept Builder Questions of Chemical Bonding - Reminding 11th15 Concept Builder Questions of Chemical Bonding - Reminding 11th15 Concept Builder Questions of Chemical Bonding - Reminding 11th46 mins
Full Chapter Quiz | Solid State | Check your learningFull Chapter Quiz | Solid State | Check your learningFull Chapter Quiz | Solid State | Check your learning43 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses