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Chapter 10: Q76E. (page 592)
Describe the crystal structure of Pt, which crystallizes with four equivalent metal atoms in a cubic unit cell
The crystal structure of Pt is face centered cubic structure.
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Explain why the enthalpies of vaporization of the following substances increase in the order CH4 < NH3 < H2O, even though all three substances have approximately the same molar mass.
Ethane \(\left( {{\rm{C}}{{\rm{H}}_3}{\rm{C}}{{\rm{H}}_3}} \right)\) has a melting point of -1830C and a boiling point of -890C. Predict the melting and boiling points for methylamine \(\left( {{\rm{C}}{{\rm{H}}_3}{\rm{N}}{{\rm{H}}_2}} \right)\). Explain your reasoning.
The edge length of the unit cell for nickel is 0.3524 nm. The density of Ni is \(8.90\;{\rm{g}}/{\rm{c}}{{\rm{m}}^3}\). Does nickel crystallize in a simple cubic structure? Explain.
Elemental carbon has one gas phase, one liquid phase, and two different solid phases, as shown in the phase diagram
(a) On the phase diagram, label the gas and liquid regions.
(b) Graphite is the most stable phase of carbon at normal conditions. On the phase diagram, label the graphite phase.
(c) If graphite at normal conditions is heated to 2500 K while the pressure is increased to 1010 Pa, it is converted into diamond. Label the diamond phase.
(d) Circle each triple point on the phase diagram.
(e) In what phase does carbon exist at 5000 K and 108 Pa?
(f) If the temperature of a sample of carbon increases from 3000 K to 5000 K at a constant pressure of 106 Pa, which phase transition occurs, if any?
What types of liquids typically form amorphous solids?
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