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Vitamin K is involved in normal blood clotting. When 1.91 g of vitamin K is dissolved...

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Chemistry

Vitamin K is involved in normal blood clotting. When 1.91 g ofvitamin K is dissolved in 25.0 g of camphor, the freezing point ofthe solution is lowered by 6.40 °C. The freezing point and Kfconstant for camphor can be found here. Calculate the molar mass ofvitamin K.

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3.6 Ratings (443 Votes)

a) Massof solute = 1.91 g vitamin K

b ) Tf= 6.40 degC

c)Formula;

               Tf=Kf m

Where   Tf is the depression in freezing point

            Kf molal depression constant of thesolvent

              mmolality

       m = Tf/Kf

           =6.40 0C/ 37.8 degC/m

          =0. 169 m

d) Tf=Kf m i

    From that m value found to be 0.169 m.

   molality =no.of mols of solute/1Kg of solvent

   0.16 mol/Kg = no.of mols of solute/0.025

   no.ofmols of solute =0.169 x 0.025

                                 =0.00423 moles

e) molar mass ofthe solute =mass of solute/no.of mols of solute

                                        = 1.91 g/0.00423 mols

                                         =451.5 g/mol
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