Trouton\'s rule Trouton\'s rule states that the entropy of vaporization is almos

Question

Trouton's rule

Trouton's rule states that the entropy of vaporization is almost the same value, about 87-88 J/(Kmol), for various types of liquids.

This implies that approximately the same amount of disorder is generated in the passage of one mole of a substance from liquid to gas, when comparisons are made at the normal boiling point.

Part B

Predict which of the following compounds follow Trouton's rule.

Check all that apply.

Liquid Boiling point
(K) Enthalpy of
vaporization
(kJ/mol) benzene 353.1 30.72 toluene 383.6 33.18 nonane 423.8 37.18 chloroform 334.2 29.24 n-propanol 370.2 41.44 ammonia 239.6 23.35

Explanation / Answer

trouton's rule states that the molar entropy of vaporization is constant
S = 87- 88 J/K-mole

Tbp = Hvap / Svap

or

Svap = Hvap / Tbp

Check all that apply.

n-propanol

41.44*1000 / 370.2 = 111.94 J/K-mole

Thus this compound is not follow the Trouton's rule.

Ammonia

23.35*1000 / 239.6= 97.45 J/K-mole

Thus this compound is not follow the Trouton's rule

Chloroform:

29.24*1000 / 334.2 = 87.5 J/K-mole

Thus this compound is follow the Trouton's rule

nonane

37.18*1000 / 423.8 =87.7 J/K-mole

Thus this compound is follow the Trouton's rule

Toluene

33.18*1000 / 383.6 =86.5 J/K-mole

Thus this compound is follow the Trouton's rule

Benzene

30.72*1000 / 353.1=87.0 J/K-mole

Thus this compound is follow the Trouton's rule

n-propanol

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.