The plot given below shows P–T curves (where P is the pressure and T is the temperature) for two solvents X and Y and isomolal solutions of NaCl in these solvents. NaCl completely dissociates in both the solvents.
On addition of equal number of moles of a non-volatile solute S in equal amount (in kg) of these solvents, the elevation of boiling point of solvent X is three times that of solvent Y. Solute S is known to undergo dimerization in these solvents. If the degree of dimerization is 0.7 in solvent Y, the degree of dimerization in solvent X is ____.
Text Solution
Verified by Experts0.05
(0.05)
Sol. 2 = 2 (K b ) x m
1 = 2 (K b ) y m
= 2
Δ (T b ) x = 
(K b ) x m …
Δ (T b ) y = 
(K b ) y m …
On taking the ratio of eq. no. &
⇒ 3 = 
× 2
= 1.5 × 0.65
β = 0.05
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