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  • The freezing point of a solution containing  of benzoic acid <img alt="(M=122\; g\; mol^{-1})" src="https://learn.careers360.com/latex-image/?%5Cinline%20%28M%3D122%5C%

The freezing point of a solution containing 5g of benzoic acid (M=122\; g\; mol^{-1}) in 35\; g of benzene is depressed by 2.94\; K. What is the percentage association of benzoic acid if it forms a dimer in solution ?
(Kf for benzene =4.9\; K\; kg\; mol^{-1} )

 

Answers (1)

\Delta T_{f} = i K_{f}m\\ 2.94 = i\times 4.9 \times 5\times 1000/122\times35\\ i = 0.512\\ \alpha = i-1/\frac{1}{n} - 1\\ = 0.976\\ = 97.6 percent

 

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