Use Trouton's constant to estimate the enthalpy of condensation of diethyl ether,which boils at 309 K. A)(-26 kJ.mol^-1) B)+26 kJ.mol^-1 C)(-275 kJ.mol^-1) D)(-85 kJ.mol^-1) E)+85 kJ.mol^-1

Question

Quizplus · Accepted Answer

Trouton's constant is approximately 85 J/mol·K for many liquids. The enthalpy of vaporization (and thus condensation) can be estimated as ΔHvap = T * ΔSvap, where ΔSvap is Trouton's constant. For diethyl ether at 309 K, ΔHvap ≈ 309 K * 85 J/mol·K = 26,265 J/mol ≈ 26 kJ/mol. Since condensation is the reverse of vaporization, the enthalpy of condensation is negative, thus -26 kJ/mol.

Use Trouton's Constant to Estimate the Enthalpy of Condensation of Diethyl