Question

frnds pls solve this along with step iam new to this app pls don't spam​

Answer 1

$\red{ \sf{Answer}}$

9.4 × $10^{-3}$

$\red{ \sf{Explanation}}$

question is from inversion of can sugar

chapter kinetics class 12.

The kinetics of the reaction is studied by noting vhange in anglenof rotation at different intwrval of time with help of polarimeter .

It is evident that the reading at zero time will be positive and would decrease with the passage of time, pass through zero and ultimately become negative.

rinfinity -r0 proportional to. x

rinfinity -rt proportional to a-x

$k = \frac{2.303}{t} log( \frac{r_\infty - r_0}{r_\infty - r_t} )$

where,

$r_\infty$ is rotation at time t =0

rt is rotation at time t =t

rinfinity is rotation at time t= infinity

On putting values ,

$\rightarrow k = \frac{2.303}{10} log( \frac{-14.1 - 32.4}{-14.1- 28.2} )$

$\rightarrow k = \frac{2.303}{10} log( \frac{46.5}{42.3} )$

$\rightarrow k = 9.4 \times 10^{-3}$

note:- if you take t = 20 you get same answer which proves that it is unimolecular reaction .

inversiin of can sugar is psudo unimolecular reaction.

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