Question

A TARLES ca Part I: Benzoic acid and laurie Acid Mass of uric acid grams) Mass of benzoic acid grams) Freezing temperature of pure lauric acid (°C) From Part 8.02 11.04 g. 4 2.95 4 227900 Freezing point of the benzoic acid and lauricucid ("C) Part III: Unknown solute and lauric Acid Mass of lauric acid (grams) 8.0 49 Mass of unknown solute (grams) P.98g Freezing temperature of pure lauric acid ("C) (From Part 45°C Freezing point of the unknown solute and lauric acid (C) 45.273¢

Answer 1

The solutions are given below :

13 14 15 16 20 21 22 23 726 29 30 31 24 25 Thursday !. At= k= Cayoscopic Constamt %3D 279-42.950) = 3.90 xm 47 m molatity of 8olution %3D 3.90 61 at- deproztion of frebing quie mol 47-279-42-950) point mol/g Giventhat, O.9 (An3 .) Kf= 3.90 C. C-kg.mel" at- (47-279-42-95) 28 Friday of 2. The mass lauoic acid is(w)= 8-02 x 1D 8.02: Let, the mole no. where of ben 2oic acid be n2 i.e. W2 M2 Wo is the mass of Solule and M2 is molas mass. mol/kg W2 Henee, M2 Wi -3 0.9X8.02XID n2 = 0.0072 (Ans) %3D

17 18 19 20 24 25 26 27 37 Saturday The reporimenta W2 molas mass ot ben2oic acid : 1.04 W2= 1:04 = 144 g/mol %3D 0.0072 n2= 0:0072 28 Sunday

4. The accepted molar mass of beveoic acid glmol glmal (7*12) + (6x4) (ex6) will be Atomic weght = 12 122 g/mol %3D 30 Saturday The discrepenty between the oxperimental and accepted vaheio 5. (ke pori montal makar mast – accepted mohr mast L ym X100 aceepted tublas wass 144- 12 2 X 100 122 18: 08 Y. discrepamcy %3D