14. By what factor does the average velocity of a gaseous molecule increase when the absolute temperature is doubled? (A) 1.4 (B) 2.0 (C) 2.8 (D) 4.0 15. Which species is expected to have the highest boiling point at 1 am pressure? 16. What is the vapor pressure of a solution with a benzene to octane molar ratio of 2:1? Vapor Pressure at 50 °C benzene 280 mmHg octane 400 mmHg
17. Which halogen in its standard state has the greatest absolute entropy per mole? 18. Which combination of vapor pressure, intermolecular forces and Hvaporizationis matched correctly? : vapor pressure intermolecular forces Hvaporization(A) F2(g) (B) Cl2(g) (C) Br2(l) (D) I2(s) 19. Calculate H° for this reaction. C2H2(g) + 2H2(g) ---> C2H6(g) Hcombustion, kJ mol¯1C2H2(g) -1300 H2(g) -286 C2H6(g) -1560 (A) -312 kJ (B) -26 kJ (C) +26 kJ (D) +312 kJ 20. For which process would S° be expected to have the greatest positive value? (A) O2(g) + 2H2(g) ---> 2H2O(g) (B) H2O(s) ---> H2O(l) (C) H2(g) + I2(g) ---> 2HI(g) (D) N2O4(g) ---> 2NO2(g) 21. (1/2) N2(g)+ (3/2) H2(g) ---> NH3(g) For this reaction at 25 °C, G°fis -16.5 kJ mol¯1. What is the equilibrium constant, Keq, for this reaction at this temperature?
(A) 1.08 (B) 7.80 x 102(C) 4.57 x 106(D) 2.98 x 103422. What are the signs for H, S, and G for the freezing of liquid water at -10 °C? H S G 23. Which of these factors affect the value of the specific rate constant for the reaction 2A(g) ---> B(g)? I concentration II pressure III temperature 24. Which statement about work and heat is true? 25. The reaction between KMnO4and H2C2O4can be followed by monitoring the disappearance of the purple color of the MnO4¯ ion. These data were obtained for the reaction carried out at a constant temperature of 25 °C. Exp [MnO4¯] [H2C2O4] Initial Rate, Disappearance of MnO4¯ (aq), M s¯11 1.08 x 10¯2M 1.98 M 5.4 x 10¯52 1.08 x 10¯2M 3.97 M 1.1 x 10¯43 2.17 x 10¯2M 1.98 M 2.1 x 10¯4Specify the order of this reaction with respect to [MnO4¯] and [H2C2O4]
[MnO4¯] [H2C2O4] (A) 1st order 2nd order (B) 2nd order 1st order (C) 1st order 1st order (D) 2nd order 2nd order
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