The following reaction has ΔG° = -190.60 kJ: H2(g) + Cl2(g) ⇌ 2 HCl (g) All three gases are placed in a sealed vessel. What is the ΔG at -10.5 °C of the system if the pressure of H2 is 3.2 atm, the pressure of Cl2 is 9.7 atm, and the pressure of HCl is 7.65 atm?

1 answer

dG = dGo + RTlnQ.
Q if you have forgotten is
(HCl)^2/(Cl2)(H2) for this reaction and plug in those concentrations in the problem. Remember R is 8.314, convert -10.5 to kelvin and remember to use dGo and dG in joules (not kJ)