Question

Times New Ro - 12 AA AA EI Аавьса Аавьса AABB 211 1 No Spac... 1 Normal Title Paragraph Styles Editing Paste B abe *, A2 A 1 Clipboard Font Part 2: Using Freezing Point Depression to Find Molar Mass Table 2: Freezing Point Depression. Mass of lauric acid in mixture (from test tube) 6.03 g 0.79 g 4.48 °C Mass of benzoic acid in mixture (from test tube) Freezing temperature depression, AT: comparing pure and mixture Molality of the solution Show calculations (AT=Kemi and Ke= 3.9°C-kg/mol mol/kg The solvent is: Lauris Acid The solute is: Benzoic Acid Write the value and units for molality, including the chemical names (place lauris acid and benzoic acid into the expression for molality). Note: this equation is already set up. Click in the box to fill in values and complete chemical units moles of Lauric Acid kg of Benzoic Acid Calculate the moles of benzoic acid from the molality: Show calculation Calculate the molar mass of benzoic Show calculate Structure of benzoic acid (draw using blue/black ink or insert structure using Page 2 of 4 793 words DR O Type here to search

Answer 1

Answer: O conceutration of a solut Ducrease in freezing point of solvent, due to the addit mon volatile solute is termed as freezing point depressions for dilute solutions, depression in freezing front (ATA) directly proportional to the molal conceutration in a solution. DTf am Lo Tf - Kf m] where; Kf molal freezing point depression constant me molality. Molality & Mass of solute Mass of solute solvent - moles of solute Mass of solvent (ks) Molar mass x de given : - Mass of solute (Benzoic Acid) = 0.79g Mass of solvent (Lauric Acid) = 6.03g OT = 4.48° C kg = 39°C kg/mol Steps: Calculating the molality : (expression) Moles of Benzoic acid Mass of Lauric Aud (kg) Molality = 1 - For calculating molality, we need the calculated values of moles of hanned Benzou acid : Mole = Mass Molar mass Molar Mass of Benzoic acid (Cy Ho O₂) = 12x7 +681 + 16 X 2 Molar Mass = 122g /mol. Mole = 0.0065 mots

thus Molality = Moles of Mass of Benzoic Laurie Acid Aud (kg) - 0.0065 mofx1000 6.03 kg -0.0065 mol of Benzoic acid 0.00603 kg of Lauric acid - 1.08 m [ Modality= 1.08ml (C₂H6O₂) u. Structure of Benzoic acid 0304