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Half life time of the following first order reaction is 20 min A→B+C .If initial pressure of A is 1 atm then total pressure after 80 min is

Half life time of the following first order reaction is 20 min A→B+C .If initial pressure of A is 1 atm then total pressure after 80 min is
 

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Grade:12th pass

2 Answers

Shivansh
askIITians Faculty 267 Points
5 years ago
After 80min, 4 half-livespass
The remaining pressure would be 1/16 of initial for A
hence total pressure will be -

1/16 + 15/16 + 15/16 = 1.93atm
Vikas TU
14149 Points
5 years ago
Given reaction is:
A->B+C
        P=1
After 20min
         P=0.5
Therefore
p-x       x         x
total pressure is p+x
80min is 4 half life times so the pressure of A is 1/16
Therefore 1-x=1/16
So x=15/16
Total pressure is 1+15/16=31/16.

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