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Asked by brijk456 | 03 Sep, 2019, 12:06: AM
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Option (2) is correct.
 
Given:
 
Kf of water = 1.86  °C m−1 
 
Weight of solute = 5 gm
 
Weight of solvent = 45 gm
 
Molar mass of Na2SO4 = 142
 
ΔTf = −3.82 °C
 
We know,
 
increment straight T subscript straight f space equals space fraction numerator straight i cross times straight K subscript straight f space cross times straight W subscript 2 cross times 1000 over denominator straight M subscript 2 cross times straight W subscript 1 end fraction space space space space straight i space equals space fraction numerator increment straight T subscript straight f space cross times straight M subscript 2 cross times straight W subscript 1 over denominator straight K subscript straight f space cross times straight W subscript 2 cross times 1000 end fraction space space space space space equals space fraction numerator 3.82 cross times 142 cross times 45 over denominator 1.86 cross times 5 cross times 1000 end fraction space space straight i space space equals space 2.624
 
       ≈ 2.63
 
van't Hoff factor is 2.63
 
 
Answered by Varsha | 03 Sep, 2019, 03:30: PM

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