Chemical Kinetics - Result Question 58

####58. 2X(g)3Y(g)+2Z(g)

Time
(in min)
0 100 200
Partial pressure of
X (in mm of Hg )
800 400 200

Assuming ideal gas condition. Calculate

(a) order of reaction

(b) rate constant

(c) time taken for 75 completion of reaction

(d) total pressure when px=700mm

(2005,4M)

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Answer:

Correct Answer: 58. (20.74min)

Solution:

  1. (a) Partial pressure becomes half of initial in every 100min, therefore, order =1.

(b) k×100=ln800400=ln2k=6.93×103min1

(c) For 75% reaction; time required =2× half-life =200min

(d) 2X(g)3Y(g)+2Z(g)

800x32x  Total pressure =800+32x  Also 800x=700x=100  Total pressure =800+32×100=950mmHg



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