The addition of 250 mg of naphthalene in benzene elevated the boiling point of 100g of benzene by 0.05 degrees celcius at 1.01x10^5 Pa. Calculate the molar mass of naphthalene molecules. Benzene has a booling point of 80.01 celcius and the Kb for benzene is 2.53 degrees celcius -kg/mol.

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