Addition of `0.643` g of a compound to `50` mL of benzene (density : `0.879` g/mL ) lowers the freezing point from `5.51

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Q 2677134086.     Addition of `0.643` g of a compound to `50` mL of benzene (density : `0.879` g/mL ) lowers the freezing point from `5.51° C` to `5.03^0 C`. If `K_f` for benzene `5.12` calculate the molecular weight of the compound.
JEE 1992

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