Chapter 12, Problem 42E

Determine $\Delta G°$ for the following reactions.

(a) Antimony pentachloride decomposes at 448 °C. The reaction is: ${\text{SbCl}}_5\left(g\right)\to {\text{SbCl}}_3\left(g\right)+{\text{Cl}}_2\left(g\right)$

An equilibrium mixture in a 5.00 L flask at 448 °C contains 3.85 g of SbCl₅, 9.14 g of SbCl₃, and 2.84 g of Cl₂.

(b) Chlorine molecules dissociate according to this reaction:

${\text{Cl}}_2\left(g\right)\to 2\text{Cl}\left(g\right)$

1.00% of Cl₂ molecules dissociate at 975 K and a pressure of 1.00 atm.