Question
Asked Dec 1, 2019
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2. Vitamin K is involved in the blood clotting mechanism. When 0.500 g of Vitamin K is dissolved
in 10.0 g of camphor (kfp 40.0 °C/m), the freezing point is lowered by 4.43 °C. Calculate the
molecular weight of vitamin K.
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2. Vitamin K is involved in the blood clotting mechanism. When 0.500 g of Vitamin K is dissolved in 10.0 g of camphor (kfp 40.0 °C/m), the freezing point is lowered by 4.43 °C. Calculate the molecular weight of vitamin K.

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3. The true molecular weight of vitamin K is 450.70 g/mol. Calculate the percent error in your
experimental determination from Problem 2.
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3. The true molecular weight of vitamin K is 450.70 g/mol. Calculate the percent error in your experimental determination from Problem 2.

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Expert Answer

Step 1

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Step 2

The depression or lowering in freezing point is expressed as:

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AT Kfx m ...(1) Where, AT K depression in freezing point freezing point depression constant m -molality

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Step 3

Given,

Mass of Vitamin K (solute) = 0.5 g

Mass of camphor (solvent) = 10.0 g = 0.01 kg     (1g = 0.001 kg)

Lowering in freezing point, △Tf = 4.43 oC

Freezing point d...

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AT K molality 4.43 °C 40.0 °C/m x molality 4.43 °c molality 40.0 °C/m molality 0.11075 m molality 0.11075 mol/kg (1 m 1 mol/kg)

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