The boiling point of carbon tetrachloride given the following thermodynamic parameters?

Question

Estimate the boiling point of carbon tetrachloride given the following thermodynamic parameters

CCl 4 (λ) CCl 4 (g)

ΔH°f(kJ/mol) -128.4 -96.0
ΔS°f( J/K·mol) 214.4 309.7
ΔG°f(kJ/mol) -57.6 -53.6

a.69 °C
b.109 °C
c.-272 °C
d.67 °C
e.25 °C

Answer 1

First, calculate ΔH and ΔS for the reaction.

Then, use the relationship ΔG=ΔH-TΔS. At the boiling point, ΔG for boiling is 0. So, you can solve for T.

ΔH= -96.0-(-128.4) = 32.4 kJ/mol
ΔS = 309.7-214.4 = 95.3 J/mol K

0=32400 J/mol - T (95.3 J/mol K)
-32400 / 93.3 = 340.0 K = 67 °C

Answer 2

Boiling Point Of Carbon Tetrachloride