12. Which statement about relative humidity is false? a. ratio of actual partial pressure of water to its equilibrium pa

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12. Which statement about relative humidity is false? a. ratio of actual partial pressure of water to its equilibrium partial pressure b. rises when the temperature increases and the actual partial pressure of water is constant c. reaches 100% at the dew point d. indicates the level of water vapor in the atmosphere e. the actual partial pressure of water can equal the equilibrium partial pressure
39. Which statement about crystalline solids is false? a. All crystal lattices are three-dimensional repetitions of one of seven types of unit cells. b. A unit cell is the smallest part of a crystalline lattice that can reproduce the entire crystal structure. c. The three types of cubic unit cells are primitive, body-centered, and face-centered. d. For a given size atom or monatomic ion, a body-centered cubic lattice has a higher unit cell density than a face-centered cubic lattice. e. A unit cell can contain nonmetal atoms, metal atoms, monatomic ions, polyatomic ions, or
41. Sodium iodide forms a face-centered cubic unit cell with iodide atoms at the lattice points. If the ionic radii of the sodium and iodide ions are 98 and 220 pm, respectively, what is the density of Nal? a. 2.0 g/cm³ b. 3.9 g/cm² c. 4.1 g/cm³ d. 14 g/cm³ e. 31 g/cm³