SolutionHard
Question
Ratio of ᐃTb / Kb of 6% AB2 and 9% A2B (AB2 and A2B both are non-electrolytes) is 1 mol/kg in both cases. Hence, atomic masses of A and B are respectively :
Options
A. 60, 90
B.40, 40
C.40, 10
D.10, 40
Solution
ᐃT = 
(AB2) =
= 1
∴ m1 (AB2) = 60 = A + 2B
(A2B) = 
= 1
∴ m1 (A2B) = 90 = 2A + B
∴ A = 40, B = 10
(AB2) = = 1∴ m1 (AB2) = 60 = A + 2B
(A2B) = = 1∴ m1 (A2B) = 90 = 2A + B
∴ A = 40, B = 10
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