Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an antimalarial agent. When 3.28 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 8.43 °C. The freezing point and Kf constant for cyclohexane can be found here.

Question

Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an antimalarial agent. When 3.28 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 8.43 °C. The freezing point and Kf constant for cyclohexane can be found here.
Calculate the molar mass of quinine.

DrBob222 · Answer

delta T = Kf*m Solve for m. m = mols quinine/kg solvent Solve for mol quinine mol quinine = g quinine/molar mass quinine. Solve for molar mass.

bill · Answer

43.4