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 carbon tetrachloride 349.8 29.82 ethanol 351.3 38.56 water 373 40.65

Explanation / Answer

delta S= delta Hvap / T

{ T = in kelvin }

1). delta S for benzene

deltaS = (30.72 x 1000 J/mol) / 353.1 K

delta S = 87.0 J K1 mol1

2). delta S for toluene

delta S = (33180 J/mol / 383.6 K)

deltaS = 86.49 J K1 mol1

3). delta S for nonane

deltaS = (37180 J/mol / 423.8 K)

deltaS = 87.7 J K1 mol1

4). deltaS for carbon tetrachloride

deltaS = 85.25 J K1 mol1

5). deltaS for benzene

deltaS = 109.76 J K1 mol1

6). delta S for tolune

deltaS = 108.98 J K1 mol1

ans;- benzene, toluene,nonane,carbon tetrachloride

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