During a spectroscopic evaluation of the several solutions of C6H5CH=CHCCl₂ in ethanol using a 1.0 cm spectrophotometric cell, different values of absorbance (A) were obtained, which are given in the following table: 105 × conc. mol dm-3 A time min A 0.446 0.080 0 0.560 0.812 1.335 0.145 0.240 When the reaction of C6H₂CH=CHCCl₂ with C₂H5O in an ethanolic medium is followed spectroscopically at a convenient wavelength (2), the following results are found: 40 0.283 80 0.217 2.105 0.305 0.378 120 1.711 0.168 140 0.149 The values of & at λ and the rate constant for that reaction are:

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During a spectroscopic evaluation of the several solutions of
C6H5CH=CHCCl₂ in ethanol using a 1.0 cm spectrophotometric cell, different
values of absorbance (A) were obtained, which are given in the following table:
105 x conc.
mol dm-3
A
time
min
A
0.446
0.080
0
0.560
C
When the reaction of C6H5CH=CHCCl₂ with C₂H5O in an ethanolic medium is
followed spectroscopically at a convenient wavelength (2), the following
results are found:
0.812
0.145
40
0.283
1.335
1.711
0.240 0.305
80
0.217
120
2.105
0.378
0.168
140
0.149
The values of ε at λ and the rate constant for that reaction are:
a.
ε = 1.79x10-6 dm³ mol-¹ cm-¹ and k = 0.034 dm³ mol-¹ min-¹
b. ε = 1.79×104 dm³ mol-¹ cm-¹ and k = 0.034 dm³ mol-¹ min-¹
c. ε = 1.79x10-6 dm³ mol-¹ cm-1 and k = 8.9x10-³ dm³ mol-¹ min-¹
d. ε = 1.79×104 dm³ mol-¹ cm-¹ and k = 8.9x10-³ dm³ mol-¹ min¯¹
Transcribed Image Text:During a spectroscopic evaluation of the several solutions of C6H5CH=CHCCl₂ in ethanol using a 1.0 cm spectrophotometric cell, different values of absorbance (A) were obtained, which are given in the following table: 105 x conc. mol dm-3 A time min A 0.446 0.080 0 0.560 C When the reaction of C6H5CH=CHCCl₂ with C₂H5O in an ethanolic medium is followed spectroscopically at a convenient wavelength (2), the following results are found: 0.812 0.145 40 0.283 1.335 1.711 0.240 0.305 80 0.217 120 2.105 0.378 0.168 140 0.149 The values of ε at λ and the rate constant for that reaction are: a. ε = 1.79x10-6 dm³ mol-¹ cm-¹ and k = 0.034 dm³ mol-¹ min-¹ b. ε = 1.79×104 dm³ mol-¹ cm-¹ and k = 0.034 dm³ mol-¹ min-¹ c. ε = 1.79x10-6 dm³ mol-¹ cm-1 and k = 8.9x10-³ dm³ mol-¹ min-¹ d. ε = 1.79×104 dm³ mol-¹ cm-¹ and k = 8.9x10-³ dm³ mol-¹ min¯¹
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