Solute A associates in water. When 0.7 g of solute A is dissolved in 42.0 g of water, it depresses the freezing point by 0.2°C. The percentage association of solute A in water, is [Given : Molar mass…

Question

Solute A associates in water. When 0.7 g of solute A is dissolved in 42.0 g of water, it depresses the freezing point by 0.2°C. The percentage association of solute A in water, is [Given : Molar mass of A = 93 g mol^-1. Molal depression constant of water is 1.86 K kg mol^-1]

Accepted Answer

Correct answer: D. (d) ∆T=i k_f×m 0.2=i×1.8 6× 0.79 3× 1 0 0 04 2 i= 0.2×9 3×61.8 6×1 0 0 i=0.60 2 A A_2 1−α α2 i=1−α+ α2 i=1− α2 1− α2=0.6 0 1−0.6 0= α2 α=0.8 0

$Solute A associates in water. When 0.7 g of solute A is dissolved in 42.0 g of water, it depresses the freezing point by 0.2°C. The percentage association of solute A in water, is [Given : Molar mass of A = 93 g m o l^{- 1} . Molal depression constant of water is 1.86 K kg m o l^{- 1}]$

Solution

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