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If a  nonvolatile, yellow crystalline solid sample of 0.351 g is dissolved in benzene (C6H6) of 15.8 g formed a solution. this solution freezes at the temperature of 4.77 degree celsius. determine the molar mass of this yellow solid. ( freezing point of benzene = 5.51 degree celsius and the freezing point depression constant, kf, = 4.90 oC/m.)

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