At what temperature would a $1\mathrm{.}10molkgk{g}^{-1}$NaCl solution freeze, given that the van't Hoff factor for NaCl is $1\mathrm{.}9?K_f$ for water is $1\mathrm{.}86Cmo{l}^{-1}kg.$

Express your answer with the appropriate units.

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Part B

A $0\mathrm{.}050$molL$-1$ solution of $AlC{l}_3$ had an observed osmotic pressure of $3\mathrm{.}85$ bar at $20C.$ Calculate the van't Hoff factor i for $AlC{l}_3.$

Express your answer numerically.

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$i=$