12 For which of the following substances the standard molar entropy is zero at 25°C ?
(A) Na_(S)
(B) N_2(g)
(C) I_2(S)
(D) all of these
(E) None of these.

13 For which of the following standard enthalpies of formation is not zero (25°C)?(A) Na(s) (B) N2(g) (C) I2(g) (D) C(s, graphite) (E) None of these.

14For a reversible adiabatic expansion of an ideal gas, which of the following is always true? (A) The work done by the gas is equal to the decrease in the internal energy of the gas. (B) The work done by the gas is equal to the heat absorbed by the gas. (C) The temperature of the gas will rise. (D) PV=C where C is a constant along the path. (E) No work is done by the gas to the surroundings.

15 For which statement about the Joule-Thomson (J-T) experiment is not true? (A) J-T expansion is an isenthalpic process (ΔΗ = 0). әт (B) is called the J-T coefficient µJT.  (C) Any gas will be cooled by J-T expansion. (D) For ideal gases µJT = 0. (E) A positive J-T coefficient implies that the gas cools upon expansion.

16 For a gas whose equation of state is= RT (a simplified Van der Waals equation), the generalized (a and k represent thermal expansion coefficient and isothermal compressibility, respectively). The difference of these two heat capacities is equal to (A) nR (B) (C) R-b (D) 0 (E) nb

17Which of the following is true? (A) An increase of pressure always leads to a boiling point elevation for all substances. (B) An increase of pressure always leads to a melting point depression for all substances. (C) The slope of the solid-liquid coexistence curve in the P-T phase diagram is positive if the solid is less dense than the liquid. (D) In the P-V phase diagram, the solid-liquid coexistence region is broader than the gas-liquid coexistence region. (E) In the P-T phase diagram the Clausius-Clapeyron equation can be used to show that the slope of the solid-gas coexistence curve must be less than the slope of the liquid-gas coexistence curve near the triple point.

18Given that the molar enthalpy of vaporization is 42.7kJ/mole and is independent of temperature, what is the boiling point of water if the atmospheric pressure becomes 427 torr? (A) 85 °C (B) 77°C (C) 56°C (D) 42 °C (E) None of these.

19Which of the following about thermodynamic equilibria is not true? (A) At phase equilibrium, a substance that occurs in two phases will have the same concentration in both phases. (B) For a single component substance at a fixed value of pressure, the change of slopes in the plot of the chemical potential versus temperature across different phases represents the variation of the molar entropies of phases. (C)△rG is the net difference of chemical potentials between products and reactants for the reaction. (D) △rGº representing the change in standard Gibbs energy for the reaction between unmixed reactants to form unmixed products is a function of temperature only. (E)△rG = −RT In Kp+ RT InQ where Q represents the reaction quotient.

20Which of the following statements is not true? (A) The total partition function for a collection of N independent molecules or atoms can be expressed as the product of the molecular partition functions q for the individual species. (B) If these molecules or atoms are indistinguishable, the total partition function is divided by a factor of N!. (C) The existence of the 1/N! factor in the expression of Q for ideal gases is noticeable only in the entropy expression, but is not noticeable in the internal energy expression because the differential of the logarithm of 1/N! is zero. (D) The molecular partition function q for an ideal gas molecule can be decomposed into the sum of the partition functions for four types of degree-of-freedom: translational, vibrational, rotational, and electronic. (E) The vibrational partition function of a polyatomic molecule is a product of harmonic oscillator partition functions for each normal mode. 

22The rate of formation of NH3, namely d[NH3]/dt, in the reaction N2 (g) + 3H2 (g) →2 NH3 (g) was reported as 1.2 mol L-¹ s-¹ (L is liter) under certain conditions. What is the rate of consumption of H2 gas, namely, d[H2]/dt=? (A) 1.2 mol L-¹ s-¹ (B) 1.4 mol L-¹ s-¹ (C) 1.8 mol L-¹ s-¹ (D) 2.4 mol L-¹ s-¹ (E) Not enough information.

23 The gaseous isomerization reaction, CH3NC → CH3CN, displays first-order kinetics, namely rate k[CH3NC]. Measurements at 500 K show that the concentration of the reactant has declined to 75% of its initial value after 440 s. How much time will be required for the concentration of CH3NC to drop to 25% of its initial value? (A) 640 s (B) 880s (C) 1320 s (D) 1680 s (E) 2120 s.

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