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Mustafa Rampersaud
Asked: 2022-11-06T13:35:08+05:30 In:

What will be the precentage of dimerisation of 61 g of benzoic acid in 1000 g of a solvent prodicing a depression is freezing point of `2^(@)C` ? (Given `K_(f)` for solvent =6 K kg `mol^(-1)`)
A. 0.72
B. 0.67
C. 0.43
D. 0.28

What will be the precentage of dimerisation of 61 g of benzoic acid in 1000 g of a solvent prodicing a depression is freezing point of `2^(@)C` ? (Given `K_(f)` for solvent =6 K kg `mol^(-1)`)
A. 0.72
B. 0.67
C. 0.43
D. 0.28
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1 Answer

  1. Correct Answer – b
    `DeltaT_(f)=ixxK_(f)xxmori=(DeltaT_(f))/(K_(f)xxm)`
    `m=W_(B)/(M_(B)xxW_(A))=((61g))/((122″g mol”^(-1))xx(1kg))=0.5″mol kg”^(-1)`
    `i=((2K))/((6 “K kg mol”^(-1))xx(0.5″mol kg”^(-1)))=0.67`
    `alpha=((1-i))/((1-1/n))=((1-0.67))/((1-0.5))=0.33/0.5=66%`

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