Determine the difference in freezing temperatures, ΔT, between the pure lauric acid (t1) and the mixture of lauric acid and benzoic acid (t2). Use the formula, ΔT = T1- T2.2.Calculate molality (m), in mol/kg, using the formula, Δt = Kf• m (Kf= 3.9°C-kg/mol for lauric acid). 3.Calculate moles of benzoic acid solute, using the answer in Step 2 (in mol/kg) and the mass (in kg) of lauric acid solvent.4.Calculate the observedlmolecular weight of benzoic acid, in g/mol. Use the original mass of benzoic acid fromthe Data and Calculations table, and the moles of benzoic acid you found in the previous step.5.Determine the expectedmolecular weight for benzoic acid from its formula, C6H5COOH.6.Calculate the percent error.7. Include a full error analysis in your lab report.
DATA AND CALCULATIONSMass of lauric acid________ gMass of benzoic acid________ gFreezing point of pure lauric acid________ °CFreezing point of the benzoic acid- lauric acid mixture________ °CFreezing temperature depression, t________ °CMolality, m________ mol/kgMoles of benzoic acid________ molMolecular weight of benzoic acid(experimental)________ g/molMolecular weight of benzoic acid(accepted)________ g/molPercent error%100ExpectedExpected-Observed=Error %x________ %