Chem 112 Exam AID Course Pack

A change to re establish equilibrium pressure will

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Unformatted text preview: by the surroundings and 15 kJ of heat is given up by the system to the surroundings? a) b) c) d) e) +35 kJ - 10 kJ - 35 kJ +10 kJ +25 kJ 2 The molar mass of a gas wihich has a density of 1.429 g/L at 101.3 kPa and 273 K is: a) b) c) d) e) 16 g/ mol 32 g/mol 14 g/mol 28 g/mol 8 g/mol 3. Calculate the value of ∆Ho for the reaction CuCl2(s) + Cu(s) è༎ 2 CuCl(s) given the information Cu(s) + Cl2(g) è༎ CuCl2(s) ∆Hf = - 206 kJ/mol 2 Cu(s) + Cl2(g) è༎ 2 CuCl(s) ∆Hf = - 36 kJ/mol a) b) c) d) - 242 kJ/mol +170 kJ/mol - 170 kJ/mol - 188 kJ/mol Ethan Newton & Barry Zhang for SOS Winter 2012 33 e) +242 kJ/mol Ethan Newton & Barry Zhang for SOS Winter 2012 34 4. What are the hybrid orbitals used in explaining the bonding of boron in BF3? sp3d sp2 sp3d2 sp sp3 a) b) c) d) e) 5. What is the energy of an X- ray photon with a wavelength of 0.154 nm? a) b) c) d) e) 1.02 x 10- 43 J 1.95 x 1018 J 1.02 x 10- 33 J 1.29 x 10- 15 J 1.54 x 10- 9 J 6. What is the partial pressure of benzene in the vapour phase in equilibrium with a 29%, by mass, solution of benzene (C6H6) in octane (C8H18) at 20oC? The vapour pressure of benzene at 20oC is 10kPa. a) b) c) d) e) 2.9 kPa 10 kPa 25 kPa 5.2 kPa 3.7 kPa 7. 2.227 g of copper oxide when heated strongly in hydrogen gave 1.978 g of pure copper. What is the empirical formula of the copper oxide? a) Cu2O b) c) CuO d) e)Cu3O2 Cu2O3 CuO2 8. Which of the following molecules is non polar? a) b) c) d) e) SeO2 NH3 H2O ClF5 XeF4 Ethan Newton & Barry Zhang for SOS Winter 2012 35 9. The chemical formula for aluminum sulfite is: a) b) c) d) e) Al2SO3 Al(SO3)3 Al2(SO3)3 Al3(SO3)2 none of these 10. The normal boiling point of chloroform (CHCl3) is 61.2oC. At a pressureof 1.1 atm, the boiling point is expected to be: a) b) c) d) e) <61.2oC >61.2oC 61.2oC 61.1oC none of these 11. Which of the following compounds would be expected to have the highest normal boiling point (the strongest intermolecular bonds)? a) b) c) d) e) I2 ICl HI KI NH3 12. What is the mole fraction of the solute in a 4.45 molal aqueous (water solvent) solution? a) b) c) d) e) 0.074 0.080 0.223 0.437 0.666 13 The ground state electronic configuration for S2- is: a) b) c) d) e) 1s22s22p6 1s22s22p62d8 1s22s22p63s23p2 1s22s22p63s23p4 1s22s22p63s23p6 Ethan Newton & Barry Zhang for SOS Winter 2012 36 14 Which of the following statements is true for a solution consisting of two volatile components in which the attractive forces between solute and solvent molecules are stronger than solute- solute or solvent- solvent attractive forces? a) b) c) Raoult’s Law...
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