1. A molecule has a ground state and two excited electronic energy levels, all of which are nondegenerate； ε0= 0, ε1 =1 x 10-20J, and ε2=3 x 10-20J, What fraction of each level is occupied at 298 K and 1000 K?

2. The forward rate constant for the elementary reaction C2H6(g)→ 2 CH3(g) is 0.00157 s-1 at 1000 K. What is the rate constant for the backward reaction at this temperature ? For CH3(g) and C2H6(g) the standard Gibbs free energies of formation are 159.74 kJ/mol and 109.55 kJ/mol, respectively, at 1000 K.

1. A molecule has a ground state and two excited electronic energy levels, all of which are nondegenerate； ε₀= 0, ε₁ =1 x 10^-20J, and ε₂=3 x 10^-20J, What fraction of each level is occupied at 298 K and 1000 K?

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