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When 12 . 2   g of benzoic acid is dissolved in 100   g of water, the freezing point of solution was found to be - 0 . 93   ° C K f H 2 O = 1 . 86   K   kg   mol - 1 . The number n of benzoic acid molecules associated (assuming 100 % association) is _.

Correct answer

2

Step-by-step solution

ΔT f = i × k f × m 0 - - 0 . 93 = i × 1 . 86 × 12 . 2 122 × 100 × 1000 i = 0 . 93 1 . 86 = 0 . 5 i = 1 + 1 n - 1 α 1 2 = 1 + 1 n - 1 × 1 n = 2

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