PART II (Free-Response Questions) 1. (a) Draw the Maxwell speed distribution curves for nitrogen gas at three different temperatures and the distribution of speeds for three gases at 300 K. (1.5 pts) (b) Draw an example for each case, showing the geometry of AXmYn (X=bonded atoms and Y=lone pair electrons) with (a) (m=4, n=1) (b) (m=4, n=2), (c) (m=3, n=2) combinations. (1.5 pts) 2. What would you expect to be the electron-group arrangement around atom A in each of the following cases? For each arrangement, give the ideal bond angle and the direction of any expected deviation: (2 pts) (a) (b) X-A=X (c) (d) X-A-X X-A: X=A-X (e) X=A=X () on (2 pts) 3. At what conditions the non-ideal gas behaves as ideal? Derive ideal gas equation. 4. Draw the Lewis structures of the following. (a) SF4 (b) XeF4 (c) PCI (d) Al2O3 (2 pts) 5. For each of the following use the molecular shape, predict the dipole moment and polarity. (a) trans C2H2Cl2 (b) CC14 (c) SO2 (d) BF3 (2 pts) Answer the following Problems (No. 6 - No. 9). 6. A mixture of gases contains 4.46 moles of neon (Ne), 0.74 mole of argon (Ar), and 2.15 moles of xenon (Xe). Calculate the partial pressures of the gases if the total pressure is 2.00 atm at a certain temperature. (1 pts) 7. Calculate the enthalpy of reaction for the process H2(g)+F2(g)--2HF(g), where H-H bond enthalpy=436.4 kJ/mol, F-F=156.9 kJ/mol and H-F=568.2 kJ/mol. (1 pts) 8. Calculate the root-mean-square speed of Cl2 and H2 molecules at 20C. (1 pts) 9. Use a Born-Haber cycle for NaCl to calculate the lattice energy of NaCl using the following: (1 pts) Na(s) - Nag) AH= 109 kJ Cl2(g) 2Cl(g) AH= 243 kJ Na(g) Na (g) +e AH= 496 kJ Cl(g)+e-CH(g) AH= -349 kJ Na(s) +1/2Cl2(g) NaCl(s) AH= -411 kJ