Sushmita

I am not looking for just the answer, but rather to understand what I am doing incorrectly.

My problem is "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 1.71 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 4.39 °C. The freezing point and Kf constant for cyclohexane can be found here. Calculate the molar mass of quinine."

I think the concept I am struggling with most is the temperature. I know the temperature lowered by 4.39°C, so that should be ΔT. Next, I used ΔT=Kf x m. Given that Kf is 20.8, I plugged everything into the problem and got 0.211 mol/kg for my molality. Next, I multiplied my molality by the mass of the quinine (1.71g or 0.00171 kg) and got 3.6 x 10-4. When using that to find molar mass, I put 1.71g/3.6 x 10-4 mol for a final answer of 4,739.34 g/mol.

I've tried the problem a few different times and got answers such as 4.74 g/mol, 646.69 g/mol and so on. I feel like I am using the correct method, but somewhere along the line I am messing up a number or equation. Your help would be greatly appreciated!

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