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Chapter 10: Q79E. (page 592)
Cobalt metal crystallizes in a hexagonal closest packed structure. What is the coordination number of a cobalt atom?
The coordination number of cobalt in hexagonal closest packing structure is 12.
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On the basis of intermolecular attractions, explain the differences in the boiling points of n-butane \(\left( { - 1 ^\circ C} \right)\) and chloroethane \(\left( {12 ^\circ C} \right),\)which have similar molar masses.
Explain the following observations:
(a) It takes longer to cook an egg in Ft. Davis, Texas (altitude,5000 feet above sea level) than it does in Boston (at sea level).
(b) Perspiring is a mechanism for cooling the body.
Ethyl chloride is used as a local anesthetic. When the liquid is sprayed on the skin, it cools the skin enough to freeze and numb it. Explain the cooling effect of liquid ethyl chloride.
Is it possible to liquefy nitrogen at room temperature (about 25 °C)? Is it possible to liquefy sulfur dioxide at room temperature? Explain your answers.
Aluminum (atomic radius \( = 1.43{A^o}\) ) crystallizes in a cubic closely packed structure. Calculate the edge length of the face-centered cubic unit cell and the density of aluminum.
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