Calculate the molality of a nonvolatile solution if the solution freezes at $-0.95^{\circ}C$ $[K_f \text{ for water} = 1.86 \ K \ kg \ mol^{-1}, \text{ freezing point of water} = 0^{\circ}C]$.
- A$0.51 \ mol \ kg^{-1}$
- B$0.41 \ mol \ kg^{-1}$
- C$0.51 \ mol \ kg^{-1}$
- D$0.65 \ mol \ kg^{-1}$
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