93年 - 93 淡江大學轉學考物理化學#56166

科目：研究所、轉學考(插大)◆物理化學 | 年份：93年 | 選擇題數：0 | 申論題數：4

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所屬科目：研究所、轉學考(插大)◆物理化學

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申論題 (4)

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

C₂H_6(g)→ 2 CH_3(g)

is 0.00157 s^-1 at 1000 K. What is the rate constant for the backward reaction at this temperature ?

For CH_3(g)and C₂H_6(g)the standard Gibbs free energies of formation are 159.74 kJ/mol and 109.55 kJ/mol, respectively, at 1000 K.

3. An ideal gas expands isothermally at 27 °C into an evacuated vessel so that the pressure drops from 10 to 1 bar.

Calculate the change in thermodynamic quantities q, w, △H, △S and △G for one mole of the gas. Note the process described is an irreversible one.

4. A gas follows the equation of state P(V-b) = RT, where V is the molar volume. P,V, R,T and b are in SI units. Given that b = 0.039 dm³/mol, estimate the fugacity of the gas at 298 k and 50 bar.