Substance X Has a Heat of Vaporization of 55

question 20

Multiple Choice

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:
-S_univ

• A) 0
• B) -79.6 J/K•mol
• C) 79.6 J/K•mol
• D) -103 J/K•mol
• E) 103 J/K•mol

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