Reserpine is a natural product isolated from the roots of the shrub Rauwolfia serpentina. It was first synthesized in 1956 by Nobel Prize winner R. B. Woodward. It is used as a tranquilizer and sedative. When g reserpine is dissolved in g camphor, the freezing-point depression is ( for camphor is ). Calculate the molality of the solution and the molar mass of reserpine. Answer mol/kg;

Explanation:

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" Reserpine is a natural product isolated from the roots of the shrub Rauwolfia serpentina. It was first synthesized in 1956 by Nobel Prize winner R. B. Woodward. It is used as a tranquilizer and sedative. When 1.00 g reserpine is dissolved in 25.0 g camphor, the freezing-point depression is 2.63 °C (Kf for camphor is 40 °C·kg/mol). Calculate the molality of the solution and the molar mass of reserpine. "

The freezing-point depression is expressed by:

We put the data given by the problem and solve for m:

For the calculation of the molar mass: Molality is defined as moles of solute per kilogram of solvent:

We calculate moles of reserpine:

Finally we use the mass of reserpine and the moles to calculate the molar mass:

Keep in mind that if the data in your problem is different, the results will be different. But the solving method remains the same.

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