103年 - 103 淡江大學轉學考物理化學#53297

科目：研究所、轉學考(插大)◆物理化學 | 年份：103年 | 選擇題數：0 | 申論題數：6

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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 (6)

1.One mole of ideal gas initially at 27°C is compressed adiabatically from 6 dm³ to 3 dm³ against constant external pressure of 15 atm. Calculate AE，AH, Q, and W for this process. (Note: The heat capacity at constant volume is 20.91 Jmor^-1K^-1. 1 atm = 101.325 kPa, 0°C = 273 K.)

2.Show that entropy change in a binary mixture for isothermal process is maximum when x₁ = x₂ = 0.5, where X_i is the mole fraction of component i.

3.Half-life for disintegration of radium is 1590 years. Calculate the rate constant in s^-1. Also, how many years will be taken for the disintegration of 80 % ? (Hint: First-order reaction.)

【已刪除】4.Consider the cell

The emf of the cell at 15°C is 0.67531 V and the temperature coefficient of emf is — 0.00065 V K'1. Calculate the value of AH at 15°C and heat flow if the process is carried reversibly.

[The cell reaction is: Cd_(s) + 2AgCl_(s) CdCl_2(s)+ 2Ag_(s)]

5.(1) Calculate the change of free energy for an isothermal reversible expansion process if the pressure of one mole of ideal gas drops from 100 atm to 20 atm at 25°C.

(2) Calculate the AG if the expansion is carried against a constant pressure of 2 atm. Other conditions remain the same as in (1).