A) 73
B) 77
C) 83
D) 87
Correct Answer: A
Solution :
Normal molecular weight of \[PC{{l}_{5}}=2\times \] vapour density \[=2\times 60\] \[=120\] Observed molecular weight of \[PC{{l}_{5}}=31+(35.5)\times 5\] \[=31+177.5\] \[=208.5\] van-t Hoff factor\[(i)=\frac{208.5}{120}\] \[=1.7375=1.73\] Degree of dissociation\[=\frac{i-1}{n-1}\] \[=\frac{1.73-1}{2-1}\] \[=0.73\] % dissociation \[=0.73\times 100=73%\]
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