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# A solution of 1.25 gm of naphthalene in 60 cm3 of benzene freezes at 277.515 K. Calculate the molecular weight of naphthalene. Freezing point of pure benzene = 278.495 K. Density of benzene = 0.880 gm $cm^{–3}, K_f$ for benzene = 5.1 K per kg.

123.20
Hence (A) is the correct answer.