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

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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 Â°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 ) T_f= 6.40 degC

c)Formula;

Â Â Â Â Â Â Â Â Â Â Â Â Â Â T_f=K_f m

WhereÂ Â T_f is the depression in freezing point

Â Â Â Â Â Â Â Â Â Â Â Â K_f molal depression constant of thesolvent

Â Â Â Â Â Â Â Â Â Â Â Â Â Â mmolality

Â Â Â Â Â Â Â m = T_f/K_f

Â Â Â Â Â Â Â Â Â Â Â =6.40 ⁰C/ 37.8 degC/m

Â Â Â Â Â Â Â Â Â Â =0. 169 m

d) T_f=K_f m i

Â Â Â Â From that m value found to be 0.169 m.

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

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

Â Â no.ofmols of solute =0.169 x 0.025

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â =0.00423 moles

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

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 1.91 g/0.00423 mols

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â =451.5 g/mol

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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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50.1K

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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 Â°C. The freezing point and Kfconstant for camphor can be found here. Calculate the molar mass ofvitamin K.

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