Question

27. Lauric alcohol is obtained from coconut oil and used to make detergents. A 5,00g solution of that alcohol in 0.100kg of benzene is frozen at 4.1C. What is the molar mass of that substance? Tf 5.5C, KF 5.12C/m. 28. Adrenaline is the hormone responsible for releasing glucose in times of stress or emergency. A 0.64g adrenaline solution in 36.0g of CCl4 causes a 0.49C increase at the boiling point. What is the molar mass of the Adrenaline? Kb x 5,02C/m

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Answer 1

Amount of alcohol solution (W2) = 5000 gm Amount of benzene (wi) = 0.1 kg = (0-1X1000)9m = 100gm Freezing point Is = 4.16 Kf = 5:12 °C/m = 5.5 € let the molecular mass = mgom mole 3 we know, It-TⓇ = k£ x 1000 Wz Wim2 a> (5.5-4.1) - 5:12X 1000 500 Too M2 21, M2 = 512X1000X500 100 x 1:4 m2 = 182-86 gm/mole , : molar mass of the substance = 182.86 g/mole

28) Amount of adrenaline sojn (W2) = 0.64.9m amount of cely (w)= 36 gm kb= 5.02 c/m Boiling point of soln increases (OTb} = 0.49% let, the molar mass Mz gm/mole OTD=kbX 100002 - wim2 ar, 0.49 = 5.02 X 1000 X 0.64 368 M2 a, M2 = 5.02 X1000X0.64 0.49X36 2182.13 qm /mole molar mass of adrenaline = 182. isga/ma!