所屬科目：研究所、轉學考(插大)◆物理化學
3. Three samples of the same idcal gas (the ratio of heat capacitiesγ = 1.5) have equal volumes and temperatures. The volume of each sample is doubled, the process being isothermal, adiabatic, and isobaric, respectively. If the final pressures are equal for the three samples, the ratio of their initial pressure is (A) 1:1:1, (B) 2:2:1, (C) 1:2:1, (D) (E)
5. The specific heats of iodine vapor and solid are 0.031 and 0.055 cal/g, respectively. If the enthalpy of sublimation of iodine is 24.0 calg at 200℃, the enthalpy of sublimation of iodine at 250℃should be (A) 24.0 cal/g, (B) 26.4 cal/g, (C) 20.8 cal/g, (D) 28.6 cal/g, (E) 22.8 cailg.
6. A solution was prepared by dissolving 7.45 g of KCI in 200 g of H20 in a calorimeter with a water equivalent of 25g. The temperature of the water had reduced from 28℃ to 25℃. △H for dissolving KCl in water is (Specific heat capacity of water is 4.2 J/K/g) (A) 2.520 hJ/mol, (B) 2.835 k/mol, (C) 20.60 kJ/mol, (D) 25.20 kJ/mol, (E) 28.35 kJ/mol.
8. At 200℃, PCl5 dissociates as follows: It was found that the equilibrium vapors are 62 times as heavy as hydrogen. The percentage dissociation of PCl5 at 200℃ is (A) 34.1%, (B) 68.1%, (C) 40.5%, (D) 70.3%, (E) 50.6%.
9. The Deacon reaction is the oxidation of. At a pressure of 730 mm and with an initial mixture containing 8% HCI and 92% O2, the degree of decomposition of the HC! is 0.08. What is the equilibrium partial pressure of oxygen? (A) 566.84 mm, (B) 671.60 mm, (C) 659.92 mm, (D) 537.28 mm, (E) 670.43 mm.
10. The standard free energy of formation are 30.426 kJ/mol for trans-1,2-dichloroethene and 22.112 kJ/mol for cis-1,2-dichloroethane at 27℃. The molar ratio of trans and cis isomers at equilibrium at 27 ℃ is (A) 2:3, (B) 3:2, (C) 28:1, (D) 1:28, (E) 10:3.
16. (6%) The equilibrium is first-order in both directions. Derive an expression for the concentration of A as a function of time when the initial molar concentrations of A and B are [A]0 and [B]0.
17.(6%) Consider the following mechanism for the thermal decomposition of R2: where R2， PA， PB are stable hydrocarbons and R and R' are radicals. Find the dependence of the rate of decomposition of R2 on the concentration of R2.
18. (6%) The cxcess Gibbs energy of a certain binary mixture (A + B) is equal to gRTx(1 - x) where g is a constant and x is the mole fraction of a solute A. Find an expression for the chenical potential of A in the mixture. The chemical potential of pure A is μA*.
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(E)
It was found that the
equilibrium vapors are 62 times as heavy as hydrogen. The percentage dissociation of PCl5 at 200℃ is (A) 34.1%, (B) 68.1%, (C) 40.5%, (D) 70.3%, (E) 50.6%.
.
At a pressure of 730 mm and with an initial mixture containing 8% HCI and 92% O2, the degree of
decomposition of the HC! is 0.08. What is the equilibrium partial pressure of oxygen? (A) 566.84
mm, (B) 671.60 mm, (C) 659.92 mm, (D) 537.28 mm, (E) 670.43 mm.
are 30.426 kJ/mol for trans-1,2-dichloroethene and
22.112 kJ/mol for cis-1,2-dichloroethane at 27℃. The molar ratio of trans and cis isomers at
equilibrium at 27 ℃ is (A) 2:3, (B) 3:2, (C) 28:1, (D) 1:28, (E) 10:3.
is first-order in both directions. Derive an expression for the concentration of A as a function of time when the initial molar concentrations of A and B are [A]0 and [B]0.
where R2， PA， PB are stable hydrocarbons and R and R' are radicals. Find the dependence of the rate of decomposition of R2 on the concentration of R2.