What is the entropy when 1.38 moles of CCl₂F₂ vaporize at 25°C? [∆H(vap) = 17.2 kJ/mol at 25°C]

Question

it is not 23.736 J/K

(16./10)

Answer 1

17.2 kJ /mol x 1.38 mol = 23.74 kJ

∆Ssys = ∆H / T = 23.74 kJ / 298 K

∆S = 0.0797 kJ/K = 79.7 J/K