申論題

5. (20%) The two gases H₂(g) and D₂(g) (Deuterium molecule) are mixed in equal molar amounts. The mixture tends to react to form HD(g) (g) according to the isotope exchange reaction H₂(g) + D₂(g)⇌2HOD(g).

(b) (2%) Evaluate △_rS° of this reaction. Useful formula: Boltzmann's entropy formula S = kB In 2, where 2 is the number of microstates available. Entropy of mixing: Amix S = -n ka(x_ıln x₁ + X₂ ln x₂)