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The enthalpy change when x g of phenol dissolves in y g of $C H C l_{3}$ is given below at a certain temperature.
X Y $Δ H$ (kcal)
0.470 120 -0.02
1.410 140 -0.03
What is magnitude of enthalpy of dilution per mole of phenol, when the second solution is diluted to the concentration of the first by addition of $C H C l_{3} .$ (give value to nearest integer in Kcal/mol )

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answer is 2.

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Detailed Solution

phOH(solution II) $\to$ phOH(solution I)

$Δ H = (\frac{- 0.02}{0.47} \times 94) - (\frac{- 0.03}{1.410} \times 94) = - 2 k c a l / m o l$

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