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    Exam 10: Spontaneity, Entropy, and Free Energy
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    Substance X Has a Heat of Vaporization of 55
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Substance X Has a Heat of Vaporization of 55

Question 77

Question 77

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:
-ΔS


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

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