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Calculate molar mass using depression of freezing point ($\Delta T_f = i K_f m$) and osmotic pressure ($\Pi = i C R T$) with association and dissociation factors.
The Solutions chapter carries 7 marks in CBSE Chemistry with guaranteed numerical questions.
For electrolytes undergoing dissociation ($NaCl \rightarrow Na^+ + Cl^-$), $i = 1 + (n-1)\alpha$ where $i > 1$. For molecules undergoing association (acetic acid dimerization in benzene), $i = 1 + (\frac{1}{n}-1)\alpha$ where $i < 1$. Always calculate $i$ before substituting into colligative property formulas.
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