Question

At `518^(@)C` the rate of decomposition of a smaple of gaseous acetaldehyde, initially at a pressure of 363 torr, was 1.00 torr `s^(-1)` when `5%` had reacted and `0.5"torr" s^(-1)` when `33%` had reacted. The order of the reaction is :
A. 2
B. 3
C. 1
D. 0

Answer 1

Correct Answer - A
Let order of reaction is `(alpha)`
rate `=k(a-x)^(alpha)` (where (a-x) = Remaining conc.
`(r_(1))/(r_(2))=((a-x)^(alpha))/((a-x_(2))^(alpha))`
`(1)/(0.5)=((95)/(67))^(alpha)`
`2=(1.41)^(alpha)`
`2=(sqrt(2))^(alpha)`
`:. alpha=2`
i.e., order of reaction =2