104年 - 104 淡江大學轉學考物理化學#53194

科目：研究所、轉學考(插大)◆物理化學 | 年份：104年 | 選擇題數：0 | 申論題數：5

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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 (5)

1. Estimate the molar volume of CO₂ at 500 K and 100 atm by treating it as a van der Waals gas. The van der Waals coefficients for CO₂ are a = 3.592 dm6 atm mol^-2 and b = 4.267 x 10^-2 dm³ mol^-1. Under the stated conditions, RT/p = .0410 dm³ mol^-1. (Hint: p = nRT/(V-nb) 一 a(n/V)²) (20%)

2. Water is heated to boiling under a pressure of 1.0 atm. When an electric current of 0.50 A from a 12 V supply is passed for 300 s through a resistance in thermal contact with it, it is found that 0.798 g of water is vaporized. Calculate the molar internal energy and enthalpy changes at the boiling point (373.15 K). The molar mass of water is 18.02 g mol^-1. (20%)

3. Calculate the entropy change when argon at 25°C and 1.00 bar in a container of volume 0.500 dm³ is allowed to expand to 1.000 dm³ and is simultaneously heated to 100°C. (20%)

4. Calculate the effect on the chemical potentials of ice and water of increasing the pressure from 1.00 bar to 2.00 bar at 0 °C. The density of ice is 0.917 g cm^-3 and that of liquid water is 0.999 g cm^-3 under these conditions. (20%)

【已刪除】5. The data below show the temperature variation of the equilibrium constant of the reaction

. Calculate the standard reaction enthalpy of the decomposition. (20%)