19. Substance X has a heat of vaporization of 57.8 kJ/mol at its normal boiling point (423°C). For the process X(l) → X(g) at 1 atm and 423°C calculate the value of ΔG.
(A) 0 J
(B) 83.0 J
(C) 137 J
(D) -83.0 J
(E) -137 J

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