wiz-icon
MyQuestionIcon
MyQuestionIcon
2
You visited us 2 times! Enjoying our articles? Unlock Full Access!
Question

Phenol associates in benzene to certain extent to form a dimer.A solution containing 20×103kg of phenol in 1.0 kg of benzene has its freezing point depressed by 0.69 K. Calculate the fraction of phenol that has dimerized .
(Kf for benzene is 5.12Kkgmol1).

Open in App
Solution

2C6H5OH(C6H5OH)2
1 mole 0
1αα/2
Total=1α+α2=1α2
i=1(α/2)1=1α2
ΔTf=iKfW2×1000Mw2×W1
0.69=i×5.12×20×10394×1.0kgkg
i=1α2,α=0.733=73.3%

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Reactions in Solutions
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon