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ample 6.19. The enthalpy of combustion of ethanoic acidis given as follows:CH,COOHN)+ 2 02(g2 CO2 (g) +2 H,O (D);ΔΗ =-867.0 kJ mol-1If values of AFI of CO2(g) and H,0 1) are 393.5 kJmol-i and -286.0 heJ mol- respectively, calculate the enthalpyof formation of ethanoic acid.

Answer»

CH3COOH -----------> 4CO2+ 2H2OEnth. of combustion = Enthalpies of formation of products - enthalpies of formation of reactantstherefore,-867 kJ/mol = 4(-393.5) + 2(-285.9) - Enthalpy of formation of acetic acid.



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