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The concentration of R in the reaction R...

The concentration of `R` in the reaction `R rarr P` was measured as a function of time and the following data were obtained. What is the order of the reaction?
`|{:([R] (mol),1.0,0.75,0.40,0.10),(T (min),0.0,0.05,0.12,0.18):}|`

A

0

B

3

C

2

D

1

Text Solution

Verified by Experts

The correct Answer is:
A
Apply different integrated rate laws, starting with zero order reaction.
`k=([R]_(0)-[R])/(t)`
According to first and second entries:
`k_(1)=((1.0)-(0.75)/(0.05)=(0.25)/(0.25)=5`
According to second and third entries:
`k_(2)=((1.0)-(0.4)/(0.12)=(0.60)/(0.12)=5`
Since the value of rate constant is constant for different time intervals, it is a zero order reaction.
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