Addition of 0.643g of a compound to 50 mL of benzene (density 0.879 g/mL) lowers the freezing point from 5.51$^{\large\circ}$C to 5.03$^{\large\circ}$C. If $K'_f$ for benzene is 5.12 $k m^{-1}$. Calculate the molecular weight of the compound.

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