45. Boiling point of chloroform was raised by \( 0.323 K \), when \( 0.5143 g \) of anthracene was dissolved in \( 35 g \) of chloroform. Molecular mass of anthracene is:
\( \left( Kb\right. \) for \( \left.CHCl _{3}=3.9 K kg mol ^{-1}\right) \)
a) \( 79.42 g / mol \)
b) \( 132.32 g / mol \)
c) \( 177.42 g / mol \)
d) \( 242.32 g / mol \)