Homework 5 - Homework 5 questions Fall 2009 1 Arrange the...

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1 Homework 5 questions – Fall 2009 1. Arrange the three common unit cells in order from least dense to most dense packing. A. face-centered cubic < body-centered cubic < primitive cubic B. primitive cubic < body-centered cubic < face-centered cubic C. primitive cubic < face-centered cubic < body-centered cubic D. body-centered cubic < primitive cubic < face-centered cubic E. body-centered cubic < face-centered cubic < primitive cubic 2. What is the distance, in atomic radii, across a diagonal face of a face-centered unit cell? A. 4r 3 × B. 2r C. 4r D. 22 r × E. r 3. Tungsten crystallizes in a body-centered cubic unit cell. If the radius of a tungsten atom is 0.137 nm, what is the length of an edge of the unit cell? A. 0.119 nm B. 0.194 nm C. 0.274 nm D. 0.316 nm E. 0.548 nm 4. Platinum (atomic mass 195. g/mol) crystallizes in a face-centered cubic unit cell and has an atomic radius of 139 pm. What is the density (in g/cm 3 ) of platinum? A. 5.33 g/cm 3 B. 15.7 g/cm 3 C. 18.9 g/cm 3 D. 21.3 g/cm 3 E. 23.5 g/cm 3
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2 5. Which of the following compounds is expected to have the strongest ionic bonds? A. MgO B. KBr C. NaI D. BaO E. SrS 6. Using the thermodynamic data below and a value of -717 kJ/mole for the lattice enthalpy for KCl, calculate the ionization energy of K. Enthalpy of atomization of K +89 kJ/mol Enthalpy of formation of solid KCl -437 kJ/mol Enthalpy of formation of Cl(g) +121 kJ/mol Electron affinity of Cl(g) -349 kJ/mol A. -596 kJ/mol
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Homework 5 - Homework 5 questions Fall 2009 1 Arrange the...

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