Using freezing point depression to find molecular weight Mass of Lauric Acid (g) 8.003 Mass of benzoic Acid (g) 1.010 Freezing temperature of pure lauric acid ( ) 43.84 Freezing temperature of the...

Using freezing point depression to find molecular weight

a. Calculate molality (m), in mol/kg, using the formula . The Kf value for lauric acid is 3.9°C•kg/mol.

b. Calculate moles of benzoic acid solute, using the molality and the mass (in kg) of lauric acid solvent.

c. Calculate the experimental molecular weight of benzoic acid, in g/mol.

d. Determine the accepted molecular weight of benzoic acid from its formula, C6H5COOH.

e. Calculate the percent discrepancy between the experimental and accepted values.