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Using Freezing-Point Depression to Find Molecular Weight Abstract: Biphenyl (C6H5)2was used as the solute that was dissolved in the pure solvent, cyclohexane (C6H12) to measure the freezing point depression (ΔT) and apply in the equation ΔT = Kf !m. Then, the molar mass was calculated to be 131.09 g/mol, which was 14.998% error when comparing with the accepted value (154.22 g/mol). Introduction: Molar mass of a known mass solute in a known mass solution can be calculated by measuring the difference in freezing temperature and then applying to the equation for freezing point depression, ΔT = Kf !m. According to the colligative property, a solution freezes at lower temperature than a pure solvent does. In this laboratory, the pure known mass solvent, cyclohexane (C6H12) and the solution of cyclohexane and biphenyl will be measured the difference in freezing temperature (ΔT). Then, applying this value into the equation for freezing point depression ΔT = Kf !