Substance X has a heat of vaporization of 55.4 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 .     Question 23 options:   A)  79.6 J/K•mol   B)  –79.6 J/K•mol   C)  0   D)  103 J/K•mol   E)  –103 J/K•mol

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