Published by:
CGP EDU Academic Team
Published on: August 13, 2026
Decomposition of A is a first order reaction at 
and is given by 
. In a closed 1 L vessel, 1 bar 
is allowed to decompose at 
. After 100 minutes, the total pressure was 1.5 bar. What is the rate constant 
of the reaction 
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
For the reaction 
, initially pressure of A is 1 bar.
Initially: total pressure 
bar.
After 100 min : total pressure 
bar.
Using initial and final pressures, if x bar of A decomposes, then A becomes 
.
Total pressure 
, so 
bar.
For a first-order reaction: 
.
Using pressures instead: 
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