Physical Chemistry 4rd Midterm Test 2016 上.pdf

Physical Chemistry 4rd Midterm Test 2016 上.pdf - Physical...

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Physical Chemistry 4 th Midterm Test (2017/01/10) 1. a. Please derive equation RT G _ e r K from Q RT G G r r ln (5 points) b. Calculate the equilibrium constant for the ammonia synthesis reaction (N 2 +3H 2 →2NH 3 ) at 298K. Δ r G Ɵ (NH 3 , g) = 16.5 kJ mol -1 (3 points) c. Calculate the equilibrium constant for the isomerization of pentane to 2-methylbutane at 298K. ( Δ r G Ɵ for the transformation reaction is -6.7kJ mol -1 ) (3 points) d. For PbI 2(s) PbI 2(aq) , K = 1.4×10 −8 at 25°C and the standard Gibbs energy of formation of PbI 2(s) is −173.64 kJ mol −1 . Calculate the standard Gibbs energy of formation of PbI 2(aq) . (3 points) 2. a. A chemical reaction is “aA (g) + bB (g) cC (g) + dD (g) ” Please explain why equilibrium constant K ( b B a A d D c C P P P P K ) is related to the stoichiometric coefficient of the chemical reaction equation. (Start from and the standard Gibb free energy for species of A, B, C and D is ΔG Ɵ A, ΔG Ɵ B, ΔG Ɵ C and ΔG Ɵ D , respectively). (5 points) b. In the gas-phase reaction A + B
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