Part A Glacial acetio acid is the concentrated form of acetic acid, the acid in

Question

Part A Glacial acetio acid is the concentrated form of acetic acid, the acid in vinegar. The term "glacial" refers to the appearance of the solid form,which resembes glacial ie Whar is the meting point of this compound, in degrees Celsius, based on its thermodynamic data shown here? kJ/mob J/(K mol) 24.32 83.93 Express the melting point numerically in degrees Celsius. View Available Hint(s) Submit Part B Based on the following thermedyhamic cata. calculate the boiling point of echanol n degrees Cesu k// Inol. I tJ/ (K·mol)I C H OH(1) 277 180 Cllsoll(e) | 235 1 | 282 Express the boiling point numerically in degrees Celsius View Available Hint(s), 48 PM 3/6/2018

Explanation / Answer

at the melting point, the solid and liquid will be at equilibrium and hence

deltaG= gibbs free energy change= deltaH-T*deltaS= 0

or T= boiling temperature= deltaH/deltaS= 24.32Kj/mole*1000J/Kj/ 83.93 J/mol.K=289K= 289-273 deg.c= 116 deg.c

2. enthalpy of vaporization of ethanol= enthalpy of vapor -enthalpy of liquid = 277.1--235.1=42.6 Kj/mole

entropy change of vaporization of ethanol similarly = 282.6-160.6= 122 J/kmole

boiling point = deltaH/deltaS= 42.6*1000/122 K=349K= 349-273= 76 deg.c

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