The change in free energy is 19.3kJ.
What is the equilibrium constant?
Now we know that the equation of the reaction is; H₂(g) + Cl₂(g)⇔2HCI(g).
Thus we have that Kp can only be obtained at equilibrium thus we ste up the ICE table as shown;
pH2 = 1 atm
pCl2 = 1 atm
pHCl = 16.30 mm Hg or 0.02 atm
H₂(g) + Cl₂(g) ⇔ 2HCI(g)
I 1 1 0
C -x -x +2x
E 1 - x 1 -x 2x
When 2x = 0.02
x = 0.01
pH2 = 1 - 0.01
pCl2 = 1 - 0.01
pHCl = 0.02
Kp = (0.02)^2/(0.99)^2
Kp = 4.1 * 10^-4
ΔG = -RT lnKp
ΔG = - (8.314 * 298.15 * ln 4.1 * 10^-4)
= 19.3kJ
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