CBSE Class 12-science Answered
2g benzoic acid dissolved in 25g of benzene shows a depression in freezing point equal to 1.62K. Molal depression constant for benzene is 4.9KKg/mol.what is the percentage association of acid if it forms dimer in solution?
Asked by nandhini | 14 Dec, 2013, 12:23: PM
Expert Answer
WB=2g, K
=4.9K kg mol
WA=25g, 
if 'x' is degree of association then we would have (1-x) mol of Benzoic acid left undissociated and corresponding x/2 as associated moles of Benzoic acid at equilibrium. Therefore, total number of moles of particles at equilibrium is
Therefore degree of association of Benzoic acid is Benzene is 99.2 %
Answered by Vaibhav Chavan | 16 Dec, 2013, 01:34: PM
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