Calculate the cryoscopic constant $(K_f)$ when $0.8 \ g$ of a non-volatile solute with a molar mass of $64 \ g \ mol^{-1}$ is dissolved in $43 \ g$ of a solvent,lowering the freezing point by $0.34 \ K$.

  • A
    $2.5 \ K \ kg \ mol^{-1}$
  • B
    $2.0 \ K \ kg \ mol^{-1}$
  • C
    $0.85 \ K \ kg \ mol^{-1}$
  • D
    $1.17 \ K \ kg \ mol^{-1}$

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