If the freezing point of an aqueous urea solution is $271.14 \ K$ at $1 \ \text{atm}$ pressure (given $K_f$ of water = $1.86 \ K \ kg/mol$),then what is the mole fraction of urea in this solution? (Freezing point of pure water is $273 \ K$)
- A$\frac{1}{56.5}$
- B$1$
- C$\frac{55.5}{56.5}$
- D$\frac{1.86}{56.5}$
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